Update to Ubuntu 22.04 for building container init

It's necessary to get new kernel headers and seccomp.

.github/workflows/release.yml

@@ -47,7 +47,7 @@ jobs:
             }
   build-init:
     name: Build container Init
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Install Musl
         run: sudo apt-get install -y musl-tools musl