release workflow on tag push (#7)

.github/workflows/create_release.yml

@@ -0,0 +1,51 @@
+# Copyright (c) 2023, Salesforce, Inc.
+# SPDX-License-Identifier: Apache-2
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: create release
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: get pushed tag
+        id: get_pushed_tag
+        run: echo ::set-output name=TAG::${GITHUB_REF/refs\/tags\//}
+
+      - uses: actions/checkout@v4
+
+      - run: git archive --output=rules_docker_compose-${{ steps.get_pushed_tag.outputs.TAG }}.tar.gz ${{ steps.get_pushed_tag.outputs.TAG }}
+
+      - name: get SHA256 of archive
+        id: get_sha
+        run: echo "::set-output name=sha::$(sha256sum rules_docker_compose-${{ steps.get_pushed_tag.outputs.TAG }}.tar.gz | cut -f 1 -d ' ')"
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          body: |
+            ```
+            http_archive(
+                name = "rules_docker_compose",
+                sha256 = "${{ steps.get_sha.outputs.sha }}",
+                urls = ["https://github.com/${{ github.repository_owner }}/${{ github.event.repository.name }}/releases/download/${{ steps.get_pushed_tag.outputs.TAG }}/rules_docker_compose-${{ steps.get_pushed_tag.outputs.TAG }}.tar.gz"],
+            )
+            ```
+          generate_release_notes: true
+          files: rules_docker_compose-${{ steps.get_pushed_tag.outputs.TAG }}.tar.gz