CI: Add GPG keys to rgm, don't clone RGM just use the docker image (#71143)

* Add GPG keys to rgm, dont' clone RGM just use the docker image

* remove the cd command

* forgot to make drone :(

* idk

* reference script more specifically

* i guess we'll just cd /src

* Only show not found artifacts

scripts/drone/rgm.star

@@ -26,26 +26,18 @@ rgm_env_secrets = {
     "DESTINATION": from_secret(rgm_destination),
     "GITHUB_TOKEN": from_secret(rgm_github_token),
     "_EXPERIMENTAL_DAGGER_CLOUD_TOKEN": from_secret(rgm_dagger_token),
+    "GPG_PRIVATE_KEY": from_secret("packages_gpg_private_key"),
+    "GPG_PUBLIC_KEY": from_secret("packages_gpg_public_key"),
+    "GPG_PASSPHRASE": from_secret("packages_gpg_passphrase"),
 }
 
 def rgm_build(script = "drone_publish_main.sh"):
-    clone_step = {
-        "name": "clone-rgm",
-        "image": "alpine/git",
-        "commands": [
-            "git clone https://github.com/grafana/grafana-build.git rgm",
-        ],
-        "failure": "ignore",
-    }
-
     rgm_build_step = {
         "name": "rgm-build",
-        "image": "golang:1.20.3-alpine",
+        "image": "grafana/grafana-build:main",
         "commands": [
-            # the docker program is a requirement for running dagger programs
-            "apk update && apk add docker bash",
             "export GRAFANA_DIR=$$(pwd)",
-            "cd rgm && ./scripts/{}".format(script),
+            "cd /src && ./scripts/{}".format(script),
         ],
         "environment": rgm_env_secrets,
         # The docker socket is a requirement for running dagger programs
@@ -55,7 +47,6 @@ def rgm_build(script = "drone_publish_main.sh"):
     }
 
     return [
-        clone_step,
         rgm_build_step,
     ]