feat: Container based developer flow

.dockerignore

@@ -0,0 +1 @@
+node_modules

.github/workflows/test.yml

@@ -12,6 +12,21 @@ on:
       - '**.md'
 
 jobs:
+  test-containerized:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      -
+        name: Validate
+        run: docker buildx bake validate
+      -
+        name: Test
+        run: docker buildx bake test
+
   test:
     runs-on: ${{ matrix.os }}
     strategy:

Dockerfile.dev

@@ -0,0 +1,46 @@
+#syntax=docker/dockerfile:1.1-experimental
+
+FROM node:12 AS deps
+WORKDIR /src
+COPY package.json yarn.lock ./
+RUN --mount=type=cache,target=/usr/local/share/.cache/yarn \
+  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 $status; exit 1; fi
+
+FROM deps AS base
+COPY . .
+
+FROM base AS build
+RUN yarn build
+
+FROM deps AS test
+ARG TARGETOS
+ARG TARGETARCH
+ENV RUNNER_TEMP=/tmp/github_runner
+ENV RUNNER_TOOL_CACHE=/tmp/github_tool_cache
+COPY . .
+RUN yarn run test
+
+FROM base AS run-format
+RUN yarn run format
+
+FROM scratch AS format
+COPY --from=run-format /src/src/*.ts /src/
+
+FROM base AS validate-format
+RUN yarn run format-check
+
+FROM scratch AS dist
+COPY --from=build /src/dist/ /dist/
+
+FROM build AS validate-build
+RUN status=$(git status --porcelain -- dist); if [ -n "$status" ]; then echo $status; exit 1; fi
+
+FROM base AS dev
+ENTRYPOINT ["bash"]

README.md

@@ -24,6 +24,7 @@ ___
   * [inputs](#inputs)
   * [environment variables](#environment-variables)
 * [Limitation](#limitation)
+* [Development](#development)
 * [License](#license)
 
 ## Usage
@@ -178,6 +179,19 @@ secret named `GH_PAT`, the step will look like this:
           GITHUB_TOKEN: ${{ secrets.GH_PAT }}
 ```
 
+## Development
+
+```
+# format code and build javascript artifacts
+docker buildx bake pre-checkin
+
+# validate all code has correctly formatted and built
+docker buildx bake validate
+
+# run tests
+docker buildx bake test
+```
+
 ## License
 
 MIT. See `LICENSE` for more details.

docker-bake.hcl

@@ -0,0 +1,53 @@
+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 "test" {
+  inherits = ["dockerfile"]
+  target = "test"
+}
+
+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"
+}