Build only 5.20, use a different variable for suffix and also timestamp the os base containers

.woodpecker/.build-perls.yml

@@ -11,7 +11,7 @@ steps:
       - tar -xvJf output.tar.xz
       - cpanm --installdeps .
       - docker login -u simcop2387 -p $GITEA_DOCKER_TOKEN gitea.simcop2387.info
-      - perl build.pl --suffix ${CI_PIPELINE_STARTED}
+      - perl build.pl --suffix $CI_PIPELINE_CREATED --filter_tags=5.20 --build_args OS_TAG=$CI_PIPELINE_CREATED
     secrets: [gitea_docker_token]
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock

build.pl

@@ -122,7 +122,7 @@ sub run_cmd {
 
    try {
 
-   print "Running command $disp_prefix ".$cmd->[0], "\n";
+   print "Running command $disp_prefix: ".join(' ', @$cmd), "\n";
 
    return if $skip_build;
 

generate.pl

@@ -40,7 +40,8 @@ EOF
 my $config = YAML::XS::Load path("config.yml")->slurp_utf8();
 
 my $template = <<~'EOF';
-FROM {{build_image}}:{{tag}}
+ARG OS_TAG=""
+FROM {{build_image}}:{{tag}}$OS_TAG
 LABEL maintainer="Ryan Voots <simcop@cpan.org>"
 
 COPY *.patch /usr/src/perl/