ci: update build to use no external scripts

.github/workflows/github-build.yml

@@ -1,33 +1,48 @@
-name: GitHub Actions CI
+name: build
 
 on:
   push:
     branches:
       - main
+    tags:
+      - '*'
   schedule:
-    - cron:  '0 6 * * *'
+    - cron: '0 0 * * *'
 
 jobs:
-  buildx:
+  multi:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout repo
+      -
+        name: Checkout
         uses: actions/checkout@v2
-
-      - name: Set up QEMU
+      -
+        name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-
-      - uses: docker/setup-buildx-action@v1
-        id: buildx
-        with:
-          install: true
-
-      - name: Login to DockerHub
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
-      - name: Build docker container
-        run: |
-          ./buildx.sh
+      - if: github.ref == 'refs/heads/main'
+        name: Conditional(Set tag as `latest`)
+        run: echo "tag=willfarrell/crontab:latest" >> $GITHUB_ENV
+
+      - if: startsWith(github.ref, 'refs/tags/')
+        name: Conditional(Set tag as `{version}`)
+        run: echo "tag=willfarrell/crontab:${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: |
+            ${{ env.tag }}