ci: publish builds to a release tag ci-dev-build

This reserves the tag `ci-dev-build` for use by the CI.

.github/workflows/c-cpp.yml

@@ -65,4 +65,25 @@ jobs:
           name: pd-i686-linux
           path: bin/
           retention-days: 0
-      
+
+  publish-latest-build:
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/port'
+    needs: [build-i686-windows, build-i686-linux]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+        with:
+          path: ci-artifacts
+      - name: Publish latest dev-build
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          mkdir ci-release
+          pushd ci-artifacts
+          tar czf ../ci-release/pd-i686-linux.tar.gz pd-i686-linux
+          zip -r ../ci-release/pd-i686-windows.zip pd-i686-windows
+          popd
+          git tag --force ci-dev-build port
+          git push --force origin ci-dev-build
+          gh release upload --clobber ci-dev-build ci-release/*