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

Changelog-None

.github/workflows/release.yml

@@ -0,0 +1,66 @@
+---
+# https://docs.corelightning.org/docs/release-checklist
+name: "Release 🚀"
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+'
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+      - 'v[0-9]+.[0-9]+[0-9a-z]+'
+  workflow_dispatch:
+
+jobs:
+  check:
+    name: Check
+    outputs:
+      version: steps.capture.outputs.version
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-tags: true
+
+      - name: Determine version from pushed tag
+        if: ${{ github.ref_type == 'tag' }}
+        run: echo "VERSION=${{ github.ref_name }}" >> "$GITHUB_ENV"
+
+      # Relevant for testing branches.
+      - name: Determine version from pushed branch tag
+        if: ${{ github.ref_type == 'branch' }}
+        run: echo "VERSION=$(git tag --points-at HEAD)" >> "$GITHUB_ENV"
+
+      - name: Validate release
+        run: tools/check-release.sh --version=${VERSION}
+
+      - name: Catpure version output
+        id: capture
+        run: echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
+
+  release:
+    name: Release
+    needs: check
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-tags: true
+
+      # tools/build-release.sh requires lowdown
+      - name: Prepare base environment
+        run: |
+          sudo apt-get install -y lowdown
+          ./configure
+
+      - name: Build environment setup
+        run: contrib/cl-repro.sh
+
+      - name: Build release
+        run: tools/build-release.sh bin-Fedora-28-amd64 bin-Ubuntu
+
+      - name: Upload release artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          path: release/
+          if-no-files-found: error