Add github action build script

Author: martin-v

.github/workflows/build-and-test.yml

@@ -0,0 +1,66 @@
+# Script taken from
+# https://github.com/darless1/gollum/blob/docker/.github/workflows/build-and-test.yml
+# MIT License
+
+name: Build and Test Docker
+on: [push, pull_request]
+
+env:
+  CI_IMAGE: ${{ secrets.DOCKER_HUB_USERNAME }}/w2wiki:dev-${{ github.sha }}
+  DEPLOY_IMAGE: ${{ secrets.DOCKER_HUB_USERNAME }}/w2wiki:latest
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check Out Repo
+        uses: actions/checkout@v2
+      - name: Login
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+      - 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
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Containerfile
+          builder: ${{ steps.buildx.outputs.name }}
+          push: true
+          tags: ${{ env.CI_IMAGE }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}
+
+  deploy-on-master:
+    runs-on: ubuntu-latest
+    if: ${{ github.ref == 'refs/heads/master' }}
+    needs: test
+    steps:
+      - name: Login
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Pull
+        run: docker pull ${{ env.CI_IMAGE }}
+      - name: Tag
+        run: docker tag ${{ env.CI_IMAGE }} ${{ env.DEPLOY_IMAGE }}
+      - name: Push
+        run: docker push ${{ env.DEPLOY_IMAGE }}
+