build: Release build automation ([ElementsProject#7776]).

Changelog-None

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+---
+# https://docs.corelightning.org/docs/repro
+name: "Release 🚀"
+on:
+  push:
+    # TODO: Remove after testing.
+    branches:
+      - 7776-release-builds-automation
+    tags:
+      - 'v[0-9]+.[0-9]+'
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+      - 'v[0-9]+.[0-9]+[0-9a-z]+'
+  workflow_dispatch:
+
+jobs:
+  ubuntu-noble:
+    name: Release
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+
+      # tools/build-release.sh requires ./configure --reconfigure
+      - name: Prepare base environment
+        run: ./configure
+
+      - name: Build environment setup
+        run: contrib/cl-repro.sh
+
+      - name: Build release
+        # TODO: Remove forced version after testing.
+        run: FORCE_VERSION="24.08.2" tools/build-release.sh bin-Fedora-28-amd64 bin-Ubuntu sign
+
+      - name: List release directory
+        run: ls -alh release/