Container based developer flow

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.dockerignore

@@ -0,0 +1,4 @@
+/.dev
+/dist
+/lib
+/node_modules

.github/CONTRIBUTING.md

@@ -14,6 +14,19 @@ Contributions to this project are [released](https://help.github.com/articles/gi
 7. Push to your fork and [submit a pull request](https://github.com/docker/setup-qemu-action/compare)
 8. Pat your self on the back and wait for your pull request to be reviewed and merged.
 
+## Container based developer flow
+
+If you don't want to maintain a Node developer environment that fits this project you can use containerized commands
+instead of invoking yarn directly.
+
+```
+# format code and build javascript artifacts
+docker buildx bake pre-checkin
+
+# validate all code has correctly formatted and built
+docker buildx bake validate
+```
+
 Here are a few things you can do that will increase the likelihood of your pull request being accepted:
 
 - Make sure the `README.md` and any other relevant **documentation are kept up-to-date**.

.github/workflows/validate.yml

@@ -0,0 +1,25 @@
+name: validate
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'releases/v*'
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    branches:
+      - 'master'
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Validate
+        run: docker buildx bake validate

Dockerfile.dev

@@ -0,0 +1,41 @@
+#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"]

docker-bake.hcl

@@ -0,0 +1,52 @@
+variable "GITHUB_REPOSITORY" {
+  default = "docker/setup-qemu-action"
+}
+
+group "default" {
+  targets = ["build"]
+}
+
+group "pre-checkin" {
+  targets = ["update-yarn", "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 = ["."]
+}
+
+target "build" {
+  inherits = ["dockerfile"]
+  target = "dist"
+  output = ["."]
+}
+
+target "format" {
+  inherits = ["dockerfile"]
+  target = "format"
+  output = ["."]
+}
+
+target "validate-format" {
+  inherits = ["dockerfile"]
+  target = "validate-format"
+}
+
+target "validate-build" {
+  inherits = ["dockerfile"]
+  target = "validate-build"
+}
+
+target "validate-yarn" {
+  inherits = ["dockerfile"]
+  target = "validate-yarn"
+}