actions: Use docker actions

.github/workflows/main.yaml

@@ -9,23 +9,29 @@ env:
 jobs:
   docker_image_job:
     runs-on: ubuntu-18.04
-    if: github.event_name == 'push'
     steps:
-      - uses: actions/checkout@v2
+      # don't need to use the actions/checkout when working with setup-buildx-action
 
-      - name: Build image
-        run: docker build . --tag $IMAGE_NAME
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
 
-      - name: Log into GitHub Container Registry
-        run: echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u femiwiki-bot --password-stdin
+      - name: Login to GitHub Container Registry
+        if: github.repository_owner == 'femiwiki'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: femiwiki-bot
+          password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Push image to GitHub Container Registry
-        run: |
-          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
-          VERSION=$(date +%Y-%m-%dT%H-%M)-$(echo ${{ github.sha }} | cut -c1-8)
-          echo IMAGE_ID=$IMAGE_ID
-          echo VERSION=$VERSION
-          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
-          docker tag $IMAGE_NAME $IMAGE_ID:latest
-          docker push $IMAGE_ID:$VERSION
-          docker push $IMAGE_ID:latest
+      - id: version
+        run: echo "::set-output name=version::$(date +%Y-%m-%dT%H-%M)-$(echo ${{ github.sha }} | cut -c1-8)"
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        cache-from: ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:latest
+        with:
+          push: ${{ github.repository_owner == 'femiwiki' }}
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version }}
+            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:latest