github_ci: remove ubuntu 18.04 tests

Ubuntu 18.04 is already EOL, so remove the OS specific tests from CI.

Signed-off-by: Matias Elo <matias.elo@nokia.com>
Reviewed-by: Tuomas Taipale <tuomas.taipale@nokia.com>

.github/workflows/ci-pipeline-arm64.yml

@@ -59,7 +59,7 @@ jobs:
       fail-fast: false
       matrix:
         cc: [gcc, clang]
-        os: ['ubuntu_18.04', 'rocky_linux_8']
+        os: ['rocky_linux_8']
     steps:
       - uses: OpenDataPlane/action-clean-up@main
       - uses: actions/checkout@v3
@@ -174,7 +174,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu_18.04', 'ubuntu_22.04']
+        os: ['ubuntu_22.04']
     steps:
       - uses: OpenDataPlane/action-clean-up@main
       - uses: actions/checkout@v3

.github/workflows/ci-pipeline.yml

@@ -128,22 +128,6 @@ jobs:
       - if: ${{ failure() }}
         uses: ./.github/actions/build-failure-log
 
-  Build_arm64_u18:
-    runs-on: ubuntu-20.04
-    env:
-      ARCH: arm64
-      OS: ubuntu_18.04
-    strategy:
-      fail-fast: false
-      matrix:
-        cc: [gcc, clang]
-    steps:
-      - uses: actions/checkout@v3
-      - run: sudo docker run -i -v `pwd`:/odp --privileged --shm-size 8g -e CC="${{matrix.cc}}"
-               -e CONF="${CONF}" $CONTAINER_NAMESPACE/odp-ci-${OS}-${ARCH} /odp/scripts/ci/build_${ARCH}.sh
-      - if: ${{ failure() }}
-        uses: ./.github/actions/build-failure-log
-
   Build_armhf:
     runs-on: ubuntu-20.04
     env:
@@ -225,10 +209,10 @@ jobs:
       - if: ${{ failure() }}
         uses: ./.github/actions/build-failure-log
 
-  Build_gcc_u18:
+  Build_gcc_u20:
     runs-on: ubuntu-20.04
     env:
-      OS: ubuntu_18.04
+      OS: ubuntu_20.04
     strategy:
       fail-fast: false
       matrix:
@@ -321,7 +305,7 @@ jobs:
       fail-fast: false
       matrix:
         cc: [gcc, clang]
-        os: ['ubuntu_18.04', 'ubuntu_22.04']
+        os: ['ubuntu_22.04']
     steps:
       - uses: actions/checkout@v3
       - run: sudo docker run -i -v `pwd`:/odp --privileged --shm-size 8g -e CC="${{matrix.cc}}" -e ARCH="${ARCH}"