feat: add full tarball to release

Github asset does not contain submodule code, we manually create the git
archive with all submodules sources checked out to be used as a self
contained bazel module.

Author: GuillaumeLagrange

flake.nix

@@ -21,6 +21,7 @@
         commonBuildInputs = with pkgs; [
           gcc
           pkg-config
+          git-cliff
 
           # Build systems
           cmake

scripts/release.sh

@@ -24,10 +24,42 @@ if [ -z "$GITHUB_TOKEN" ]; then
 
 fi
 
+# Make sure submodules are up to date
+git submodule update --init --recursive
+
+# Check that no uncommitted changes exist
+if [ -n "$(git status --porcelain)" ]; then
+    echo "Uncommitted changes exist. Please commit or stash them before creating a release."
+    exit 1
+fi
+
 git cliff -o CHANGELOG.md --tag $VERSION --github-token $GITHUB_TOKEN
 git add CHANGELOG.md
 git commit -m "chore: Release $VERSION"
 git tag $VERSION -m "Release $VERSION"
 git push origin main
 git push origin $VERSION
-gh release create $VERSION -t $VERSION --generate-notes -d
+
+# Create tarball with submodules included
+echo "Creating release tarball with submodules..."
+TMPDIR=$(mktemp -d)
+ARCHIVE_NAME="codspeed-cpp-${VERSION}"
+TARBALL_NAME="${ARCHIVE_NAME}.tar.gz"
+
+# Create main archive
+git archive --prefix="${ARCHIVE_NAME}/" --format=tar HEAD | \
+  (cd "$TMPDIR" && tar xf -)
+
+# Add submodule content
+git submodule foreach --recursive "git archive --prefix=${ARCHIVE_NAME}/\$path/ --format=tar HEAD | (cd $TMPDIR && tar xf -)"
+
+# Create final tarball
+(cd "$TMPDIR" && tar czf "$TMPDIR/$TARBALL_NAME" "$ARCHIVE_NAME")
+
+echo "Tarball created at: $TMPDIR/$TARBALL_NAME"
+
+# Create GitHub release with the tarball
+gh release create $VERSION -t $VERSION --generate-notes -d "$TMPDIR/$TARBALL_NAME"
+
+# Cleanup
+rm -rf "$TMPDIR"