style: move push action to new dir so github and gitea can share it

.actions/init/action.yaml

@@ -0,0 +1,21 @@
+name: "initialize"
+description: "install nix & use cachix"
+
+inputs:
+  token:
+    description: "cachix auth token"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: install nix
+      uses: cachix/install-nix-action@v31
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+
+    - name: use cachix
+      uses: cachix/cachix-action@v16
+      with:
+        name: trevstack
+        authToken: "${{ inputs.token }}"

.actions/push/action.yaml

@@ -0,0 +1,60 @@
+name: "docker push"
+description: "push to docker registry"
+
+inputs:
+  server_url:
+    required: true
+  repository:
+    required: true
+  tag:
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set env
+      run: |
+        REGISTRY=$(basename ${{ inputs.server_url }})
+
+        NR=${{ inputs.repository }}
+        NAMESPACE="${NR%%/*}"
+        REPOSITORY="${NR##*/}"
+
+        TAG=${{ inputs.tag }}
+        VERSION=${TAG#v}
+
+        echo "REGISTRY=${REGISTRY}" >> $GITHUB_ENV
+        echo "NAMESPACE=${NAMESPACE}" >> $GITHUB_ENV
+        echo "REPOSITORY=${REPOSITORY}" >> $GITHUB_ENV
+        echo "VERSION=${VERSION}" >> $GITHUB_ENV
+
+    - name: Push images
+      run: |
+        docker image tag $REPOSITORY:$VERSION-amd64 $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-amd64
+        docker push $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-amd64
+
+        docker image tag $REPOSITORY:$VERSION-arm64 $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm64
+        docker push $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm64
+
+        docker image tag $REPOSITORY:$VERSION-arm $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm
+        docker push $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm
+
+    - name: Push manifest
+      run: |
+        docker manifest create $HOST/$REPOSITORY:$VERSION \
+          $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-amd64 \
+          $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm64 \
+          $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm
+        docker manifest annotate $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-amd64 --arch amd64
+        docker manifest annotate $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm64 --arch arm64
+        docker manifest annotate $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm --arch arm
+        docker manifest push $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION
+
+        docker manifest create $REGISTRY/$NAMESPACE/$REPOSITORY:latest \
+          $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-amd64 \
+          $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm64 \
+          $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm
+        docker manifest annotate $REGISTRY/$NAMESPACE/$REPOSITORY:latest $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-amd64 --arch amd64
+        docker manifest annotate $REGISTRY/$NAMESPACE/$REPOSITORY:latest $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm64 --arch arm64
+        docker manifest annotate $REGISTRY/$NAMESPACE/$REPOSITORY:latest $REGISTRY/$NAMESPACE/$REPOSITORY:$VERSION-arm --arch arm
+        docker manifest push $REGISTRY/$NAMESPACE/$REPOSITORY:latest