Add gitea runner image

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

packages/docker/gitea-act-runner-worker/default.nix

@@ -0,0 +1,37 @@
+{ pkgs, ... }:
+let
+  containerPolicy = pkgs.writeTextDir "/etc/containers/policy.json" (
+    builtins.readFile (
+      (pkgs.formats.json { }).generate "policy.json" {
+        default = [ { type = "insecureAcceptAnything"; } ];
+        transports.docker-daemon."" = [ { type = "insecureAcceptAnything"; } ];
+      }
+    )
+  );
+in
+pkgs.dockerTools.buildImage {
+  name = "gitea-act-runner-worker";
+  fromImage = pkgs.docker-image-base;
+
+  copyToRoot = pkgs.buildEnv {
+    name = "root";
+    paths = with pkgs; [
+      git
+      curl
+      jq
+      nix
+      nodejs
+      buildah
+      skopeo
+      containerPolicy
+    ];
+    pathsToLink = [
+      "/bin"
+      "/etc"
+    ];
+  };
+
+  runAsRoot = ''
+    mkdir -p /var/tmp
+  '';
+}