Fix lint and add systemd rocky 8

custom/testing/systemd-rockylinux-8.Dockerfile

@@ -0,0 +1,24 @@
+FROM rockylinux:8
+
+COPY golden-pillar-tree golden-pillar-tree
+COPY golden-state-tree golden-state-tree
+
+RUN <<EOF
+  if [ $(uname -m) = "x86_64" ]; then
+    export ARCH=x86_64
+  else
+    export ARCH=arm64
+  fi
+  yum update -y
+  yum install -y epel-release
+  yum install -y curl wget tar xz patchelf
+  wget https://packages.broadcom.com/artifactory/saltproject-generic/onedir/3007.1/salt-3007.1-onedir-linux-$ARCH.tar.xz
+  tar xf salt-3007.1-onedir-linux-$ARCH.tar.xz
+  ./salt/salt-call --local --pillar-root=/golden-pillar-tree --file-root=/golden-state-tree state.apply provision
+  rm -rf salt
+  rm -rf salt-3007.1-onedir-linux-$ARCH.tar.xz
+  rm -rf golden-pillar-tree
+  rm -rf golden-state-tree
+EOF
+
+CMD ["/bin/bash"]

custom/testing/tail

@@ -14,6 +14,9 @@ import sys
 
 
 def run_execve(cmd, args=None):
+    """
+    Run the command with execve system call.
+    """
     if args is None:
         args = []
     args = [cmd] + args
@@ -34,5 +37,5 @@ else:
         if sys.argv[1:]:
             fp.write(f"tail.real {' '.join(sys.argv[1:])}")
         else:
-            fp.write(f"tail.real")
+            fp.write("tail.real")
     run_execve("/usr/lib/systemd/systemd", ["--systemd", "--unit=rescue.target"])