chore(docker): split up amd64 / arm64 builds

attempts to help with #103

.github/workflows/docker.yml

@@ -53,7 +53,7 @@ jobs:
                 rm -rf /tmp/.buildx-cache/${{ matrix.architecture }}
                 mv /tmp/.buildx-cache-new/${{ matrix.architecture }} /tmp/.buildx-cache/${{ matrix.architecture }}
 
-    publish:
+    publish_amd64:
         needs: [test]
         runs-on: ubuntu-latest
         if: github.event_name != 'pull_request'
@@ -92,7 +92,7 @@ jobs:
               with:
                   context: .
                   push: true
-                  platforms: linux/amd64,linux/arm64
+                  platforms: linux/amd64
                   tags: ${{ steps.meta.outputs.tags }}
                   labels: ${{ steps.meta.outputs.labels }}
                   cache-from: type=local,src=/tmp/.buildx-cache/linux/amd64
@@ -101,3 +101,41 @@ jobs:
               run: |
                rm -rf /tmp/.buildx-cache
                mv /tmp/.buildx-cache-new /tmp/.buildx-cache
+
+    publish_arm64:
+        needs: [test]
+        runs-on: ubuntu-latest
+        if: github.event_name != 'pull_request' && startsWith(github.ref, 'refs/tags')
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+              with:
+                  submodules: "recursive"
+            - name: Set up QEMU
+              uses: docker/setup-qemu-action@v1
+            - name: Set up Docker Buildx
+              uses: docker/setup-buildx-action@v1
+            - name: Docker meta
+              id: meta
+              uses: docker/metadata-action@v3
+              with:
+                  images: revoltchat/server, ghcr.io/revoltchat/server
+            - name: Login to DockerHub
+              uses: docker/login-action@v1
+              with:
+                  username: ${{ secrets.DOCKERHUB_USERNAME }}
+                  password: ${{ secrets.DOCKERHUB_TOKEN }}
+            - name: Login to Github Container Registry
+              uses: docker/login-action@v1
+              with:
+                  registry: ghcr.io
+                  username: ${{ github.actor }}
+                  password: ${{ secrets.GITHUB_TOKEN }}
+            - name: Build and publish
+              uses: docker/build-push-action@v2
+              with:
+                  context: .
+                  push: true
+                  platforms: linux/arm64
+                  tags: ${{ steps.meta.outputs.tags }}
+                  labels: ${{ steps.meta.outputs.labels }}