Automate building Docker container images

.dockerignore

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+deploy/**
+.git/**
+Dockerfile
+.devcontainer/**
+.github/**

.github/workflows/docker.yaml

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+name: Docker Builds
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "v*"
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Docker Metadata (light target)
+        id: metadata_light
+        uses: docker/metadata-action@v3.6.0
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}
+          flavor: |
+            suffix=-light,onlatest=true
+          tags: |
+            type=semver,pattern={{major}}.{{minor}}.{{patch}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=edge
+
+      - name: Docker Metadata (full target)
+        id: metadata
+        uses: docker/metadata-action@v3.6.0
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}
+          tags: |
+            type=semver,pattern={{major}}.{{minor}}.{{patch}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=edge
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to Github Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Build and push (light target)
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          target: light
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/riscv64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.metadata_light.outputs.tags }}
+          labels: ${{ steps.metadata_light.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+
+      # building the full version could be done in a separate workflow,
+      # but using the same instance allows reusing the light target as a base
+      - name: Build and push (full target)
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/riscv64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache-new
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+
+        # Temp fix
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+      - name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Dockerfile

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+FROM ubuntu:20.04 as light
+
+LABEL org.opencontainers.image.authors="Phoronix Media <commercial@phoronix-test-suite.com>"
+
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y \
+  apt-file\
+  apt-utils\
+  git-core\
+  php-cli\
+  php-xml\
+  sudo\
+  unzip\
+  && rm -rf /var/lib/apt/lists/*
+
+
+WORKDIR /app/
+
+# copy in files
+COPY . /app/
+
+RUN ./phoronix-test-suite make-openbenchmarking-cache lean \
+  && rm -f /var/lib/phoronix-test-suite/core.pt2so
+
+CMD ["./phoronix-test-suite", "shell"]
+
+
+FROM light as full
+
+# install extra packages commonly used by tests
+RUN apt-get update && apt-get install -y \
+  build-essential\
+  autoconf\
+  && rm -rf /var/lib/apt/lists/*