ci: add GCC 15,16 coverage

Add CI coverage for GCC 15, 16

Author: msune

.github/workflows/ci.yaml

@@ -78,7 +78,7 @@ jobs:
   ubuntu_24_04_gcc:
     strategy:
       matrix:
-        version: [13, 14]
+        version: [13, 14, 15]
     runs-on: ubuntu-24.04
     env:
       CPP: cpp-${{ matrix.version }}
@@ -102,6 +102,42 @@ jobs:
         env:
           CONFIG_FLAGS: --disable-silent-rules --enable-debug
 
+  ubuntu_25_10_gcc:
+    strategy:
+      matrix:
+        version: [15]
+    runs-on: ubuntu-24.04
+    env:
+      CPP: cpp-${{ matrix.version }}
+      CC: gcc-${{ matrix.version }}
+      CXX: g++-${{ matrix.version }}
+    steps:
+      - name: "Checkout libcdada"
+        uses: actions/checkout@v3
+        with:
+          path: libcdada
+
+      - name: Run tests in Ubuntu 25.10 container
+        run: |
+          docker run --rm \
+            -v ${{ github.workspace }}:/workspace \
+            -w /workspace \
+            -e PPA_TOOLCHAIN_REPO="false" \
+            -e CPP="${CPP}" \
+            -e CC="${CC}" \
+            -e CXX="${CXX}" \
+            -e CONFIG_FLAGS="--disable-silent-rules" \
+            ubuntu:25.10 \
+            bash -c "
+              set -e
+              apt-get update
+              apt-get install -y git
+              git config --global --add safe.directory /workspace/libcdada
+              ./libcdada/.github/workflows/deps.sh gcc ${{ matrix.version }}
+              cd libcdada && .github/workflows/test_script.sh
+              CONFIG_FLAGS=\"\$CONFIG_FLAGS --enable-debug\" .github/workflows/test_script.sh
+            "
+
   ubuntu_22_04_clang:
     strategy:
       matrix:

.github/workflows/deps.sh

@@ -12,6 +12,8 @@ else
 fi
 
 (sudo --help > /dev/null 2>&1 ) || (apt update && apt install -y sudo software-properties-common automake autoconf libtool make) #containers
-sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+if [[ "${PPA_TOOLCHAIN_REPO}" != "false" ]]; then
+	sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+fi
 sudo apt-get update
 sudo apt-get install -y python3 valgrind $COMPILER