feat: add release action (#6)

* feat: add release action

* feat: wip

Author: ablaszkiewicz

.github/workflows/release.yml

@@ -0,0 +1,100 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+
+concurrency:
+  group: release-main
+  cancel-in-progress: true
+
+jobs:
+  read_commit_message:
+    runs-on: ubuntu-latest
+    outputs:
+      skip_release: ${{ steps.compute_msg.outputs.skip_release }}
+    steps:
+      - name: Compute commit flags
+        id: compute_msg
+        shell: bash
+        env:
+          COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
+        run: |
+          set -euo pipefail
+          if printf "%s" "$COMMIT_MESSAGE" | grep -q "chore: release to marketplace and update README.md"; then
+            echo "skip_release=true" >> $GITHUB_OUTPUT
+          else
+            echo "skip_release=false" >> $GITHUB_OUTPUT
+          fi
+  release:
+    needs: read_commit_message
+    if: ${{ needs.read_commit_message.outputs.skip_release != 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Compute next version
+        id: compute
+        shell: bash
+        run: |
+          set -euo pipefail
+          CLI_VERSION=$(grep -E 'npm i -g @posthog/cli@' action.yml | sed -E 's/.*@posthog\/cli@([0-9]+\.[0-9]+\.[0-9]+).*/\1/')
+          README_VERSION_FULL=$(grep -Eo 'uses: .*PostHog/upload-source-maps@v[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' -m1 README.md | sed -E 's/.*@v([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*/\1/' || true)
+          if [ -n "${README_VERSION_FULL:-}" ]; then
+            README_BASE=$(echo "$README_VERSION_FULL" | cut -d. -f1-3)
+            README_BUILD=$(echo "$README_VERSION_FULL" | awk -F. '{print $4}')
+          else
+            README_BASE=""
+            README_BUILD=""
+          fi
+          if [ "$CLI_VERSION" = "$README_BASE" ] && [ -n "${README_BUILD}" ]; then
+            NEW_VERSION="v${CLI_VERSION}.$((README_BUILD + 1))"
+          else
+            NEW_VERSION="v${CLI_VERSION}.0"
+          fi
+          echo "cli_version=$CLI_VERSION" >> $GITHUB_OUTPUT
+          echo "readme_version_full=${README_VERSION_FULL:-}" >> $GITHUB_OUTPUT
+          echo "new_version=$NEW_VERSION" >> $GITHUB_OUTPUT
+
+      - name: Update README usage version
+        shell: bash
+        run: |
+          set -euo pipefail
+          NEW_VERSION="${{ steps.compute.outputs.new_version }}"
+          if grep -qE 'PostHog/upload-source-maps@v[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' README.md; then
+            sed -Ei "s|PostHog/upload-source-maps@v[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+|PostHog/upload-source-maps@${NEW_VERSION}|g" README.md
+          else
+            echo "No existing version string found in README.md" >&2
+          fi
+
+      - name: Commit README change
+        id: commit_readme
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "chore: release to marketplace and update README.md"
+          branch: main
+          file_pattern: README.md
+
+      - name: Create tag
+        shell: bash
+        run: |
+          set -euo pipefail
+          NEW_VERSION="${{ steps.compute.outputs.new_version }}"
+          COMMIT_SHA="${{ steps.commit_readme.outputs.commit_hash }}"
+          if [ -z "$COMMIT_SHA" ]; then
+            COMMIT_SHA="$(git rev-parse HEAD)"
+          fi
+          git tag "$NEW_VERSION" "$COMMIT_SHA"
+          git push origin "refs/tags/$NEW_VERSION"
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.compute.outputs.new_version }}
+          make_latest: true
+          generate_release_notes: true