chore: add release automation workflows and configuration files

Author: manu4543

.github/workflows/release-please.yml

@@ -0,0 +1,19 @@
+name: release-please
+
+on:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json

.github/workflows/sync-release-as.yml

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+name: Sync Release-As from release PR title
+
+on:
+  pull_request:
+    types: [edited]
+
+permissions:
+  contents: write
+
+jobs:
+  sync:
+    if: >-
+      github.event.pull_request.base.ref == 'master' &&
+      startsWith(github.event.pull_request.head.ref, 'release-please--') &&
+      github.event.changes.title != null
+    runs-on: ubuntu-latest
+    steps:
+      - name: Extract versions from old and new title
+        id: parse
+        env:
+          NEW_TITLE: ${{ github.event.pull_request.title }}
+          OLD_TITLE: ${{ github.event.changes.title.from }}
+        run: |
+          # Anchored on pull-request-title-pattern "release: ${version}" from release-please-config.json.
+          extract() {
+            echo "$1" | grep -oE '^release:[[:space:]]+v?[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?' \
+              | sed -E 's/^release:[[:space:]]+v?//'
+          }
+          NEW_VERSION=$(extract "$NEW_TITLE")
+          OLD_VERSION=$(extract "$OLD_TITLE")
+          echo "old=$OLD_VERSION"
+          echo "new=$NEW_VERSION"
+          if [ -z "$NEW_VERSION" ]; then
+            echo "::notice::No semver in new title; nothing to do."
+            echo "skip=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          if [ "$NEW_VERSION" = "$OLD_VERSION" ]; then
+            echo "::notice::Version unchanged ($NEW_VERSION); not pushing."
+            echo "skip=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          echo "version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Check out master
+        if: steps.parse.outputs.skip != 'true'
+        uses: actions/checkout@v6
+        with:
+          ref: master
+          token: ${{ secrets.RELEASE_PLEASE_TOKEN }}
+          fetch-depth: 1
+
+      - name: Push empty Release-As commit
+        if: steps.parse.outputs.skip != 'true'
+        env:
+          VERSION: ${{ steps.parse.outputs.version }}
+        run: |
+          git config user.name "release-as-bot"
+          git config user.email "release-as-bot@users.noreply.github.com"
+          git commit --allow-empty -m "chore: pin next release
+
+          Release-As: ${VERSION}"
+          git push origin master

.release-please-manifest.json

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+{
+  ".": "5.4.0"
+}

release-please-config.json

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+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "packages": {
+    ".": {
+      "release-type": "node",
+      "package-name": "@imagekit/javascript"
+    }
+  },
+  "include-v-in-tag": true,
+  "include-component-in-tag": false,
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": false,
+  "pull-request-header": "Automated Release PR",
+  "pull-request-title-pattern": "release: ${version}",
+  "changelog-sections": [
+    { "type": "feat", "section": "Features" },
+    { "type": "fix", "section": "Bug Fixes" },
+    { "type": "perf", "section": "Performance Improvements" },
+    { "type": "revert", "section": "Reverts" },
+    { "type": "chore", "section": "Chores" },
+    { "type": "docs", "section": "Documentation" },
+    { "type": "style", "section": "Styles" },
+    { "type": "refactor", "section": "Refactors" },
+    { "type": "test", "section": "Tests", "hidden": true },
+    { "type": "build", "section": "Build System" },
+    { "type": "ci", "section": "Continuous Integration", "hidden": true }
+  ]
+}