Add github actions to check and release new PRs

.github/workflows/check.yml

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+name: Check
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: Lint code
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Lint Dockerfile
+        run: |
+          docker run --rm -i hadolint/hadolint < Dockerfile
+      - name: Lint Markdown
+        run: |
+          sudo gem install mdl
+          mdl README.md

.github/workflows/docker-publish.yml

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+name: Docker
+
+on:
+  push:
+    # Publish `master` as Docker `latest` image.
+    branches:
+      - master
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - v*
+
+  # Run tests for any PRs.
+  pull_request:
+
+env:
+  # TODO: Change variable to your image's name.
+  IMAGE_NAME: dockagator
+
+jobs:
+  # Run tests.
+  # See also https://docs.docker.com/docker-hub/builds/automated-testing/
+  test-compile:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: |
+          if [ -f docker-compose.test.yml ]; then
+            docker-compose --file docker-compose.test.yml build
+            docker-compose --file docker-compose.test.yml run sut
+          else
+            docker build . --file Dockerfile
+          fi
+
+  # Push image to GitHub Packages.
+  # See also https://docs.docker.com/docker-hub/builds/
+  push:
+    # Ensure test job passes before pushing image.
+    needs: test
+
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --file Dockerfile --tag $IMAGE_NAME
+
+      - name: Log into registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
+
+      - name: Push image
+        run: |
+          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
+
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "master" ] && VERSION=latest
+
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION

.github/workflows/release.yml

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+name: Create Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  bump-tag-version:
+    name: Bump and Tag Version
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: jefflinse/pr-semver-bump@v1
+        name: Bump and Tag Version
+        id: bump-tag-version
+        with:
+          mode: bump
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          major-label: major
+          minor-label: minor
+          patch-label: patch
+          require-release-notes: true
+          release-notes-prefix: "# Release notes"
+          with-v: true
+      - name: Print Released Metadata
+        run: |
+          echo Old Version: ${{ steps.bump-tag-version.outputs.old-version }}
+          echo New Version: ${{ steps.bump-tag-version.outputs.version }}
+          echo Release Notes: ${{ steps.bump-tag-version.outputs.release-notes }}
+      - name: Create Release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ steps.bump-tag-version.outputs.version }}
+          release_name: Release ${{ steps.bump-tag-version.outputs.version }}
+          body: >
+            Release ${{ steps.bump-tag-version.outputs.version }} of the DockaGator docker image.
+            See [`README.md`](https://github.com/GatorEducator/dockagator/blob/${{ steps.bump-tag-version.outputs.version }}/README.md)
+            for example commands and more details.
+          draft: false
+          prerelease: false

.github/workflows/validate-pr.yml

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+name: PR
+
+on:
+  pull_request:
+    types:
+      - labeled
+      - unlabeled
+      - opened
+      - edited
+      - reopened
+      - synchronize
+      - ready_for_review
+
+jobs:
+  check-pr:
+    name: Validate PR Release Label and Notes
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: jefflinse/pr-semver-bump@v1
+        name: Validate PR Metadata
+        id: validate-pr-metadata
+        with:
+          mode: validate
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          major-label: major
+          minor-label: minor
+          patch-label: patch
+          require-release-notes: true
+          release-notes-prefix: "# Release notes"
+          with-v: true
+      - name: Print Detected Metadata
+        run: |
+          echo Old Version: ${{ steps.validate-pr-metadata.outputs.old-version }}
+          echo New Version: ${{ steps.validate-pr-metadata.outputs.version }}
+          echo Release Notes: ${{ steps.validate-pr-metadata.outputs.release-notes }}