cleanup(ci): remove some no more useful jobs

Signed-off-by: Andrea Terzolo <andrea.terzolo@polito.it>

.github/workflows/ci.yml

@@ -108,68 +108,3 @@ jobs:
           pushd build
           make tests
           popd
-
-  build-ubuntu-bionic:
-    runs-on: ubuntu-18.04
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-          ref: ${{ github.event.pull_request.head.sha }}
-
-      - name: Update base image
-        run: sudo apt update -y
-
-      - name: Install build dependencies
-        run: sudo DEBIAN_FRONTEND=noninteractive apt install cmake build-essential clang llvm git linux-headers-$(uname -r) pkg-config autoconf libtool libelf-dev -y
-
-      - name: Prepare project
-        run: |
-          mkdir build
-          pushd build
-          cmake -DBUILD_BPF=On -DUSE_BUNDLED_DEPS=On ..
-          popd
-
-      - name: Build
-        run: |
-          pushd build
-          KERNELDIR=/lib/modules/$(uname -r)/build make -j4 all
-          popd
-
-      - name: Run unit tests
-        run: |
-          pushd build
-          make tests
-          popd
-
-  build-centos7-debug:
-    runs-on: ubuntu-latest
-    container:
-      image: falcosecurity/falco-builder:latest
-      env:
-        BUILD_TYPE: "debug"
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-          path: falco
-          ref: ${{ github.event.pull_request.head.sha }}
-
-      - name: Link falco repo to /source/falco
-        run: |
-          mkdir -p /source
-          ln -s "$GITHUB_WORKSPACE/falco" /source/falco
-  
-      - name: Prepare project
-        run: /usr/bin/entrypoint cmake
-
-      - name: Build
-        run: /usr/bin/entrypoint all
-
-      - name: Run unit tests
-        run: /usr/bin/entrypoint tests
-
-      - name: Build packages
-        run: /usr/bin/entrypoint package