Revert to Node 12 as default runtime

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

dev.Dockerfile

@@ -0,0 +1,78 @@
+# syntax=docker/dockerfile:1.3-labs
+
+ARG NODE_VERSION=12
+ARG DOCKER_VERSION=20.10.10
+ARG BUILDX_VERSION=0.7.0
+
+FROM node:${NODE_VERSION}-alpine AS base
+RUN apk add --no-cache cpio findutils git
+WORKDIR /src
+
+FROM base AS deps
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn install && mkdir /vendor && cp yarn.lock /vendor
+
+FROM scratch AS vendor-update
+COPY --from=deps /vendor /
+
+FROM deps AS vendor-validate
+RUN --mount=type=bind,target=.,rw <<EOT
+set -e
+git add -A
+cp -rf /vendor/* .
+if [ -n "$(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
+EOT
+
+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 <<EOT
+set -e
+git add -A
+cp -rf /out/* .
+if [ -n "$(git status --porcelain -- dist)" ]; then
+  echo >&2 'ERROR: Build result differs. Please build first with "docker buildx bake build"'
+  git status --porcelain -- dist
+  exit 1
+fi
+EOT
+
+FROM deps AS format
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run format \
+  && mkdir /out && find . -name '*.ts' -not -path './node_modules/*' | cpio -pdm /out
+
+FROM scratch AS format-update
+COPY --from=format /out /
+
+FROM deps AS format-validate
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run format-check
+
+FROM docker:${DOCKER_VERSION} as docker
+FROM docker/buildx-bin:${BUILDX_VERSION} as buildx
+
+FROM deps AS test
+ENV RUNNER_TEMP=/tmp/github_runner
+ENV RUNNER_TOOL_CACHE=/tmp/github_tool_cache
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  --mount=type=bind,from=docker,source=/usr/local/bin/docker,target=/usr/bin/docker \
+  --mount=type=bind,from=buildx,source=/buildx,target=/usr/libexec/docker/cli-plugins/docker-buildx \
+  yarn run test --coverageDirectory=/tmp/coverage
+
+FROM scratch AS test-coverage
+COPY --from=test /tmp/coverage /