Update build process with requested changes

- push to both Docker Hub and Github registry
- use git tags for versioning
- update Docker tags to reflect the git tags and commit SHA

.github/workflows/build.yml

@@ -1,9 +1,10 @@
 name: Build Docker Image
 
+# Docker Images are only built when a new tag is created
 on:
   push:
-    branches:
-      - master
+    tags:
+      - 'v*.*.*'
 
 jobs:
   build:
@@ -18,12 +19,39 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
-      - name: Login to Github
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          # Push to both Docker Hub and Github Container Registry
+          images: |
+            actualbudget/actual-server
+            ghcr.io/actualbudget/actual-server
+          # Creates the following tags:
+          # - actual-server:latest
+          # - actual-server:1.3
+          # - actual-server:1.3.7
+          # - actual-server:sha-90dd603
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha
+
+      - name: Login to Docker Hub
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Build and push standard image
         uses: docker/build-push-action@v2
         with:
@@ -39,4 +67,4 @@ jobs:
           push: true
           file: Dockerfile.alpine
           platforms: linux/amd64,linux/arm64
-          tags: ${{ secrets.DOCKERHUB_PROJECT }}:alpine
+          tags: ${{ steps.meta.outputs.tags }}