Add release workflow

.github/workflows/build.yml

@@ -1,6 +1,14 @@
 name: Build
 
-on: [push, workflow_dispatch]
+on:
+  pull_request:
+  # push:
+  workflow_call:
+    outputs:
+      artifact_name:
+        description: Name of the sanoid-portable artifact uploaded during the build.
+        value: ${{ jobs.build.outputs.artifact_name }}
+  workflow_dispatch:
 
 jobs:
   build:

.github/workflows/release.yml

@@ -0,0 +1,56 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  call-build-workflow:
+    uses: ./.github/workflows/build.yml
+
+  release:
+    runs-on: ubuntu-latest
+    needs: call-build-workflow
+    steps:
+      - name: Download sanoid-portable artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: ${{ needs.call-build-workflow.outputs.artifact_name }}
+
+      - name: Assert CHANGELOG updated for this version
+        run: |
+          version='${{ github.event.release.tag_name }}'
+          version_heading="## $version"
+
+          if ! grep -q "$version_heading" CHANGELOG.md; then
+            echo "Error: CHANGELOG.md does not appear to contain release notes for \"$version\"". A heading matching \"$version_heading\" was not found."
+            exit 1
+          fi
+
+          echo 'Ok: CHANGELOG.md contains release notes for $version'
+
+      - name: Assert sanoid-portable version matches GitHub Release version
+        run: |
+          sudo update-binfmts --install APE /bin/sh --magic MZqFpD
+
+          sudo chmod +x sanoid-portable
+          sanoid_version=$(./sanoid-portable --version)
+          release_version="${{ github.event.release.tag_name }}"
+
+          echo "GitHub Release: $release_version"
+          echo "sanoid-portable: $sanoid_version"
+
+          if [ "$release_version" != "$sanoid_version" ]; then
+            echo "Error: GitHub Release version \"$release_version\" does not match sanoid-portable version \"$sanoid_version\"."
+            exit 1
+          fi
+
+          sha256sum sanoid-portable
+          echo 'Ok: sanoid-portable version matches GitHub release version.'
+
+      # - name: Upload sanoid-portable to GitHub Release assets
+      #   uses: softprops/action-gh-release@v2
+      #   with:
+      #     files: sanoid-portable
+      #     tag_name: ${{ github.event.release.tag_name }}
+      #     fail_on_unmatched_files: true