ci: add release workflow for mc/1.20.2 maintenance branch

.github/workflows/release-1.20.2.yml

@@ -0,0 +1,72 @@
+# Prepares, builds and publishes new releases
+
+name: Release 1.20.2
+
+# On changes to release branches
+on:
+  push:
+    branches:
+      - mc/1.20.2
+  workflow_dispatch:
+
+jobs:
+  release:
+    name: Release
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: 🙌 Prepare release
+        id: release-please
+        uses: google-github-actions/release-please-action@v4
+        with:
+          config-file: .github/release-please.json
+          target-branch: mc/1.20.2
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+    outputs:
+      paths_released: ${{ steps.release-please.outputs.paths_released }}
+      releases: ${{ toJson(steps.release-please.outputs) }}
+
+  publish:
+    name: Publish
+
+    runs-on: ubuntu-latest
+    needs: release
+    if: ${{ needs.release.outputs.paths_released != '[]' }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        path: ${{ fromJson(needs.release.outputs.paths_released) }}
+
+    steps:
+      - name: ✨ Checkout repository
+        uses: actions/checkout@v4
+
+      - name: ☕ Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: 17
+          distribution: temurin
+
+      - name: 🐘 Set up Gradle
+        uses: gradle/gradle-build-action@v2
+
+      - name: 📢 Publish new release
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: ${{ matrix.path == '.' && ':publish' || format('{0}:publish', matrix.path) }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CURSEFORGE_TOKEN: ${{ secrets.CURSEFORGE_TOKEN }}
+          CURSEFORGE_DEBUG: ${{ secrets.CURSEFORGE_DEBUG }}
+          MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
+          MODRINTH_DEBUG: ${{ secrets.MODRINTH_DEBUG }}
+
+      - name: 📦 Upload artifacts
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ fromJson(needs.release.outputs.releases)[matrix.path == '.' && 'tag_name' || format('{0}--tag_name', matrix.path)] }}
+          files: ${{ matrix.path }}/**/build/libs/*
+          token: ${{ secrets.GITHUB_TOKEN }}