Wire central catalog refresh

.github/workflows/refresh-catalog.yml

@@ -0,0 +1,39 @@
+name: Refresh Catalog
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  refresh-catalog:
+    name: Refresh central catalog copy
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+          cache: gradle
+
+      - name: Refresh catalog
+        run: ./gradlew --no-daemon refreshCatalog
+
+      - name: Open pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          branch: automation/refresh-central-catalog
+          delete-branch: true
+          commit-message: Refresh central Gradle version catalog
+          title: Refresh central Gradle version catalog
+          body: |
+            Updates the local Gradle version catalog from NostrGameEngine/libs.catalog.
+
+            If the downloaded catalog is identical to the current file, this workflow exits without opening a pull request.

.github/workflows/snapshot.yml

@@ -1,6 +1,9 @@
 name: publish-snapshots
 
 on:
+  workflow_dispatch:
+  schedule:
+    - cron: '07 4 * * 0'
   push:
   pull_request:
 

build.gradle

@@ -114,3 +114,21 @@ nexusPublishing {
     }
   }
 }
+
+tasks.register('refreshCatalog') {
+    group = 'build setup'
+    description = 'Downloads the central NostrGameEngine Gradle version catalog.'
+
+    def catalogUrl = providers.gradleProperty('centralCatalogUrl')
+        .orElse('https://raw.githubusercontent.com/NostrGameEngine/libs.catalog/main/libs.versions.toml')
+    def outputFile = layout.projectDirectory.file('gradle/libs.versions.toml')
+
+    outputs.file(outputFile)
+
+    doLast {
+        def target = outputFile.asFile
+        target.parentFile.mkdirs()
+        target.text = new URI(catalogUrl.get()).toURL().getText('UTF-8')
+        println "Refreshed ${target}"
+    }
+}