CI: add github action workflows

.github/workflows/coverity.yml

@@ -0,0 +1,21 @@
+name: coverity
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  run-coverity:
+    runs-on: ubuntu-latest
+    if: github.repository == 'iLCSoft/MarlinTrkProcessors'
+    steps:
+    - uses: actions/checkout@v2
+    - uses: cvmfs-contrib/github-action-cvmfs@v2
+    - uses: aidasoft/run-lcg-view@v3
+      with:
+        coverity-cmake-command: 'cmake -C $ILCSOFT/ILCSoft.cmake ..'
+        coverity-project: 'iLCSoft%2FMarlinTrkProcessors'
+        coverity-project-token: ${{ secrets.MARLINTRKPROCESSORS_COVERITY_TOKEN }}
+        github-pat: ${{ secrets.READ_COVERITY_IMAGE }}
+        view-path: "/cvmfs/clicdp.cern.ch/iLCSoft/lcg/100/nightly/x86_64-centos7-gcc10-opt"
+        setup-script: "init_ilcsoft.sh"

.github/workflows/linux.yml

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+name: linux
+on: [push, pull_request]
+
+jobs:
+  centos7:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        COMPILER: [gcc10, clang11]
+        LCG: [100]
+        include:
+          - COMPILER: gcc8
+            LCG: 99python2
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: cvmfs-contrib/github-action-cvmfs@v2
+    - uses: aidasoft/run-lcg-view@v3
+      with:
+        view-path: "/cvmfs/clicdp.cern.ch/iLCSoft/lcg/${{ matrix.LCG }}/nightly/x86_64-centos7-${{ matrix.COMPILER }}-opt"
+        setup-script: "init_ilcsoft.sh"
+        run: |
+          mkdir build
+          cd build
+          cmake -GNinja -C ${ILCSOFT}/ILCSoft.cmake -DCMAKE_CXX_FLAGS=" -fdiagnostics-color=always " ..
+          ninja -k0
+          ctest --output-on-failure
+          ninja install