workflows: Change actions to use rocky linux instead of centos-7 (#15)

Signed-off-by: Priyankar Jain <[email protected]>

.github/workflows/pull_request.yml

@@ -21,18 +21,18 @@ jobs:
         run: sudo make check # Since some of the tests require cap_net_admin
                              # hence running the tests as sudo.
 
-  build-centos-7:
+  build-rocky-linux:
     timeout-minutes: 10
     runs-on: ubuntu-latest
-    container: centos:7
+    container: rockylinux/rockylinux:8
     steps:
       - uses: actions/checkout@v2
       - name: Install dependencies
         run: |
-          yum install -y make gcc-4.8.5 glib2-devel libmnl-devel libnetfilter_conntrack-devel check dbus
+          dnf --enablerepo=powertools install -y make gcc glib2-devel libmnl-devel libnetfilter_conntrack-devel check dbus
       - name: Build
         run: |
           make all
           # since github actions does not allow to set capability cap_net_admin
-          # to container, skipping tests on centos-7.
+          # to container, skipping tests.