build: Nightly repro build for Ubuntu Noble.

.github/workflows/repro.yml

@@ -0,0 +1,30 @@
+---
+# https://docs.corelightning.org/docs/repro
+name: Repro Build Nightly
+on:
+  # TODO: reinstate after testing
+  # schedule:
+  #   - cron: "0 3 * * *"
+  # TODO: remove after testing
+  push:
+    branches:
+      - 7117-repro-nightly-builds
+jobs:
+  ubuntu-noble:
+    name: Ubuntu Noble Repro build
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v2
+
+      - name: Build environment setup
+        run: |
+          echo "Building base image for noble"
+          docker run --rm -v $(pwd):/build ubuntu:noble bash -c "apt-get update && apt-get install -y debootstrap && debootstrap noble /build/noble"
+          tar -C noble -c . | docker import - noble
+
+      - name: Builder image setup
+        run: docker build -t cl-repro-noble - < contrib/reprobuild/Dockerfile.noble
+
+      - name: Build using the builder image
+        run: docker run --rm -v $GITHUB_WORKSPACE:/repo -e FORCE_MTIME=$(date +%F) -t cl-repro-noble

contrib/reprobuild/Dockerfile.noble

@@ -70,5 +70,5 @@ WORKDIR /build
 CMD git clone /repo . \
     && poetry export -o requirements.txt --without-hashes \
     && pip install -r requirements.txt \
-    && tools/repro-build.sh \
+    && tools/repro-build.sh --force-version=$CLN_VERSION --force-mtime=$CLN_BUILD_MTIME \
     && cp *.xz /repo/release/

tools/repro-build.sh

@@ -56,6 +56,10 @@ fi
 PLATFORM="$OS"-"$VER"
 VERSION=${FORCE_VERSION:-$(git describe --always --dirty=-modded --abbrev=7 2>/dev/null || pwd | sed -n 's,.*/clightning-\(v[0-9.rc\-]*\)$,\1,p')}
 
+# TODO: remove after testing
+echo "Repro Version: $VERSION"
+echo "Repro Forced mTime: $FORCE_MTIME"
+
 # eg. ## [0.6.3] - 2019-01-09: "The Smallblock Conspiracy"
 # Skip 'v' here in $VERSION
 MTIME=${FORCE_MTIME:-$(sed -n "s/^## \\[${VERSION#v}\\] - \\([-0-9]*\\).*/\\1/p" < CHANGELOG.md)}