WIP: test if it works in ubuntu-18.04 container on top of ubuntu-latest

JerryScript-DCO-1.0-Signed-off-by: Máté Tokodi mate.tokodi@szteszoftver.hu

.github/workflows/gh-actions.yml

@@ -275,16 +275,13 @@ jobs:
 
 # TODO: update to ubuntu-22.04
   MbedOS_K64F_Build_Test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
+    container: ubuntu:18.04
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v4
-        with:
-          python-version: '==3.8'
-      - run: python -m pip install --upgrade pip
-      - run: pip install setuptools
+      - run: sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
       - run: sudo apt update
-      - run: sudo apt install gcc-arm-none-eabi mercurial
+      - run: sudo apt install gcc-arm-embedded python3-setuptools mercurial
       - run: make -f ./targets/os/mbedos/Makefile.travis install
       - run: make -f ./targets/os/mbedos/Makefile.travis script