fix: broken "Install podman" job

Signed-off-by: spacewander <[email protected]>

Author: spacewander

.github/workflows/package-apisix-dashboard-rpm-el7.yml

@@ -116,8 +116,6 @@ jobs:
     steps:
       - name: Install podman
         run: |
-          echo 'deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/testing/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:testing.list
-          curl -fsSL https://download.opensuse.org/repositories/devel:kubic:libcontainers:testing/xUbuntu_20.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/devel_kubic_libcontainers_testing.gpg > /dev/null
           sudo apt update
           sudo apt install podman