diff --git a/.dockerignore b/.dockerignore
index 00a9f54..ccc2930 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,4 +1,2 @@
-/.dev
-/dist
-/lib
+/coverage
 /node_modules
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index d5a1c75..bfba474 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -2,7 +2,8 @@
 
 Hi there! We're thrilled that you'd like to contribute to this project. Your help is essential for keeping it great.
 
-Contributions to this project are [released](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) to the public under the [project's open source license](LICENSE).
+Contributions to this project are [released](https://docs.github.com/en/github/site-policy/github-terms-of-service#6-contributions-under-repository-license)
+to the public under the [project's open source license](LICENSE).
 
 ## Submitting a pull request
 
@@ -25,5 +26,5 @@ Here are a few things you can do that will increase the likelihood of your pull
 ## Resources
 
 - [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
-- [Using Pull Requests](https://help.github.com/articles/about-pull-requests/)
-- [GitHub Help](https://help.github.com)
+- [Using Pull Requests](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests)
+- [GitHub Help](https://docs.github.com/en)
diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index f7ca2d7..1f16063 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -30,4 +30,5 @@ about: Create a report to help us improve
 
 ### Logs
 
-> Download the [log file of your build](https://help.github.com/en/actions/configuring-and-managing-workflows/managing-a-workflow-run#downloading-logs) and [attach it](https://help.github.com/en/github/managing-your-work-on-github/file-attachments-on-issues-and-pull-requests) to this issue.
+> Download the [log file of your build](https://docs.github.com/en/actions/managing-workflow-runs/using-workflow-run-logs#downloading-logs)
+> and [attach it](https://docs.github.com/en/github/managing-your-work-on-github/file-attachments-on-issues-and-pull-requests) to this issue.
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 47b6d21..17393a9 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -10,6 +10,7 @@ on:
   pull_request:
     branches:
       - 'dev'
+      - 'releases/v*'
     paths-ignore:
       - '**.md'
 
@@ -22,4 +23,6 @@ jobs:
         uses: actions/checkout@v2
       -
         name: Validate
-        run: docker buildx bake validate
+        uses: docker/bake-action@v1
+        with:
+          targets: validate
diff --git a/Dockerfile.dev b/Dockerfile.dev
deleted file mode 100644
index c6e16ae..0000000
--- a/Dockerfile.dev
+++ /dev/null
@@ -1,41 +0,0 @@
-#syntax=docker/dockerfile:1.2
-
-FROM node:12 AS deps
-WORKDIR /src
-COPY package.json yarn.lock ./
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn install
-
-FROM scratch AS update-yarn
-COPY --from=deps /src/yarn.lock /
-
-FROM deps AS validate-yarn
-COPY .git .git
-RUN status=$(git status --porcelain -- yarn.lock); if [ -n "$status" ]; then echo $status; exit 1; fi
-
-FROM deps AS base
-COPY . .
-
-FROM base AS build
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn build
-
-FROM base AS run-format
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn run format
-
-FROM scratch AS format
-COPY --from=run-format /src/src/*.ts /src/
-
-FROM base AS validate-format
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn run format-check
-
-FROM scratch AS dist
-COPY --from=build /src/dist/ /dist/
-
-FROM build AS validate-build
-RUN status=$(git status --porcelain -- dist); if [ -n "$status" ]; then echo $status; exit 1; fi
-
-FROM base AS dev
-ENTRYPOINT ["bash"]
diff --git a/docker-bake.hcl b/docker-bake.hcl
index 137bf09..6c5d9d3 100644
--- a/docker-bake.hcl
+++ b/docker-bake.hcl
@@ -1,5 +1,11 @@
-variable "GITHUB_REPOSITORY" {
-  default = "crazy-max/ghaction-github-pages"
+variable "NODE_VERSION" {
+  default = "12"
+}
+
+target "node-version" {
+  args = {
+    NODE_VERSION = NODE_VERSION
+  }
 }
 
 group "default" {
@@ -7,46 +13,48 @@ group "default" {
 }
 
 group "pre-checkin" {
-  targets = ["update-yarn", "format", "build"]
+  targets = ["vendor-update", "format", "build"]
 }
 
 group "validate" {
-  targets = ["validate-format", "validate-build", "validate-yarn"]
-}
-
-target "dockerfile" {
-  dockerfile = "Dockerfile.dev"
-}
-
-target "update-yarn" {
-  inherits = ["dockerfile"]
-  target = "update-yarn"
-  output = ["."]
+  targets = ["format-validate", "build-validate", "vendor-validate"]
 }
 
 target "build" {
-  inherits = ["dockerfile"]
-  target = "dist"
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "build-update"
   output = ["."]
 }
 
+target "build-validate" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "build-validate"
+}
+
 target "format" {
-  inherits = ["dockerfile"]
-  target = "format"
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "format-update"
   output = ["."]
 }
 
-target "validate-format" {
-  inherits = ["dockerfile"]
-  target = "validate-format"
+target "format-validate" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "format-validate"
 }
 
-target "validate-build" {
-  inherits = ["dockerfile"]
-  target = "validate-build"
+target "vendor-update" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/vendor.Dockerfile"
+  target = "update"
+  output = ["."]
 }
 
-target "validate-yarn" {
-  inherits = ["dockerfile"]
-  target = "validate-yarn"
+target "vendor-validate" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/vendor.Dockerfile"
+  target = "validate"
 }
diff --git a/hack/build.Dockerfile b/hack/build.Dockerfile
new file mode 100644
index 0000000..a0796d7
--- /dev/null
+++ b/hack/build.Dockerfile
@@ -0,0 +1,42 @@
+# syntax=docker/dockerfile:1.2
+ARG NODE_VERSION
+
+FROM node:${NODE_VERSION}-alpine AS base
+RUN apk add --no-cache cpio findutils git
+WORKDIR /src
+
+FROM base AS deps
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn install
+
+FROM deps AS build
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run build && mkdir /out && cp -Rf dist /out/
+
+FROM scratch AS build-update
+COPY --from=build /out /
+
+FROM build AS build-validate
+RUN --mount=type=bind,target=.,rw \
+  git add -A && cp -rf /out/* .; \
+  if [ -n "$(git status --porcelain -- dist)" ]; then \
+    echo >&2 'ERROR: Build result differs. Please build first with "docker buildx bake build"'; \
+    git status --porcelain -- dist; \
+    exit 1; \
+  fi
+
+FROM deps AS format
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run format \
+  && mkdir /out && find . -name '*.ts' -not -path './node_modules/*' | cpio -pdm /out
+
+FROM scratch AS format-update
+COPY --from=format /out /
+
+FROM deps AS format-validate
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run format-check \
diff --git a/hack/vendor.Dockerfile b/hack/vendor.Dockerfile
new file mode 100644
index 0000000..dd7906b
--- /dev/null
+++ b/hack/vendor.Dockerfile
@@ -0,0 +1,23 @@
+# syntax=docker/dockerfile:1.2
+ARG NODE_VERSION
+
+FROM node:${NODE_VERSION}-alpine AS base
+RUN apk add --no-cache git
+WORKDIR /src
+
+FROM base AS vendored
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn install && mkdir /out && cp yarn.lock /out
+
+FROM scratch AS update
+COPY --from=vendored /out /
+
+FROM vendored AS validate
+RUN --mount=type=bind,target=.,rw \
+  git add -A && cp -rf /out/* .; \
+  if [ -n "$(git status --porcelain -- yarn.lock)" ]; then \
+    echo >&2 'ERROR: Vendor result differs. Please vendor your package with "docker buildx bake vendor-update"'; \
+    git status --porcelain -- yarn.lock; \
+    exit 1; \
+  fi