.github: install microxrceddsgen from source

... until image is udpated

Author: peterbarker

.github/workflows/test_dds.yml

@@ -169,13 +169,22 @@ jobs:
       - name: setup ccache
         run: |
           . .github/workflows/ccache.env
+      # install install Micro-XRCE-DDS-Gen from source until image is updated
+      - name: install Micro-XRCE-DDS-Gen from source
+        run: |
+          cd /tmp
+          git clone --recurse-submodules https://github.com/ardupilot/Micro-XRCE-DDS-Gen.git
+          cd Micro-XRCE-DDS-Gen
+          ./gradlew assemble
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: dds-${{matrix.config}}
         shell: 'script -q -e -c "bash {0}"'
         run: |
           git config --global --add safe.directory ${GITHUB_WORKSPACE}
           PATH="/github/home/.local/bin:$PATH"
+          PATH="/tmp/Micro-XRCE-DDS-Gen/scripts:$PATH"
+          which microxrceddsgen
           Tools/scripts/build_ci.sh
 
       - name: Archive buildlog artifacts