[Java] Add missing repos for Clang

Author: vyazelenko

.github/workflows/ci.yml

@@ -128,6 +128,13 @@ jobs:
  key: ${{ runner.os }}-gradle-wrapper
  - name: Install compiler
  run: |
+ sudo add-apt-repository "deb http://dk.archive.ubuntu.com/ubuntu/ xenial main"
+ sudo add-apt-repository "deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe"
+
+ if [ "${{ matrix.version }}" = "9" ]; then
+ sudo add-apt-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main"
+ fi
+
  sudo apt-get install -y clang-${{ matrix.version }}
  - name: Build
  run: ./cppbuild/cppbuild