Add github actions

.github/workflows/CI.yml

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+name: CI
+on:
+  push:
+    branches:
+      - main
+
+env:
+  DOCKER_USERNAME: thedoorknobster
+  REPO: thedoorknobster/sample-app
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          # Fetch all commits
+          fetch-depth: 0
+
+      - name: Semantic versioning
+        id: versioning
+        uses: PaulHatch/[email protected]
+        with:
+          branch: main
+          tag_prefix: "v"
+          major_pattern: "BREAKING CHANGE:"
+          minor_pattern: "feat:"
+          format: "v${major}.${minor}.${patch}-prerelease${increment}"
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ env.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ${{ env.REPO }}:latest,${{ env.REPO }}:${{ steps.versioning.outputs.version }}
+
+      - name: Create Release
+        if: ${{ !startsWith(github.ref, 'refs/tags/') }}
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.github_token }}
+        with:
+          tag_name: ${{ steps.versioning.outputs.version }}
+          release_name: ${{ steps.versioning.outputs.version }}
+          prerelease: true

.github/workflows/release.yml

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+name: release
+on:
+  push:
+    tags:
+      - 'v*'
+
+env:
+  DOCKER_USERNAME: thedoorknobster
+  REPO: thedoorknobster/sample-app
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          # Fetch all commits
+          fetch-depth: 0
+
+      - name: Set environment variables
+        run: |
+          cat >> $GITHUB_ENV << EOF
+          VERSION=${GITHUB_REF##*/}
+          EOF
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ env.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ${{ env.REPO }}:latest,${{ env.REPO }}:${{ env.VERSION }}