CI: Add dagger cloud token to PR steps for caching (#81817)

* Add dagger cloud token to steps for caching

* lint

.drone.yml

@@ -572,6 +572,9 @@ steps:
     --build-id=$$DRONE_BUILD_NUMBER --grafana-dir=$$PWD > packages.txt
   depends_on:
   - yarn-install
+  environment:
+    _EXPERIMENTAL_DAGGER_CLOUD_TOKEN:
+      from_secret: dagger_token
   image: grafana/grafana-build:main
   name: rgm-package
   pull: always
@@ -719,6 +722,9 @@ steps:
   - find ./dist -name '*docker*.tar.gz' -type f | xargs -n1 docker load -i
   depends_on:
   - yarn-install
+  environment:
+    _EXPERIMENTAL_DAGGER_CLOUD_TOKEN:
+      from_secret: dagger_token
   image: grafana/grafana-build:main
   name: rgm-build-docker
   pull: always
@@ -1840,6 +1846,9 @@ steps:
     --build-id=$$DRONE_BUILD_NUMBER --grafana-dir=$$PWD > packages.txt
   depends_on:
   - update-package-json-version
+  environment:
+    _EXPERIMENTAL_DAGGER_CLOUD_TOKEN:
+      from_secret: dagger_token
   image: grafana/grafana-build:main
   name: rgm-package
   pull: always
@@ -2023,6 +2032,9 @@ steps:
   - find ./dist -name '*docker*.tar.gz' -type f | xargs -n1 docker load -i
   depends_on:
   - update-package-json-version
+  environment:
+    _EXPERIMENTAL_DAGGER_CLOUD_TOKEN:
+      from_secret: dagger_token
   image: grafana/grafana-build:main
   name: rgm-build-docker
   pull: always
@@ -4788,6 +4800,6 @@ kind: secret
 name: gcr_credentials
 ---
 kind: signature
-hmac: c04928dc37abd22bc2d48c971f4f1fdfd722d38629016139fd0304e2aef60213
+hmac: f82455098bcac4c4b46f62ec7bc768660ccce0bb4c869da8bb85026e5845aa49
 
 ...

scripts/drone/steps/rgm.star

@@ -7,6 +7,11 @@ load(
     "scripts/drone/variables.star",
     "golang_version",
 )
+load(
+    "scripts/drone/vault.star",
+    "from_secret",
+    "rgm_dagger_token",
+)
 
 def artifacts_cmd(artifacts = []):
     cmd = "/src/grafana-build artifacts "
@@ -25,6 +30,9 @@ def rgm_artifacts_step(name = "rgm-package", artifacts = ["targz:grafana:linux/a
         "image": "grafana/grafana-build:main",
         "pull": "always",
         "depends_on": depends_on,
+        "environment": {
+            "_EXPERIMENTAL_DAGGER_CLOUD_TOKEN": from_secret(rgm_dagger_token),
+        },
         "commands": [
             cmd +
             "--go-version={} ".format(golang_version) +
@@ -46,6 +54,9 @@ def rgm_build_docker_step(ubuntu, alpine, depends_on = ["yarn-install"], file =
         "name": "rgm-build-docker",
         "image": "grafana/grafana-build:main",
         "pull": "always",
+        "environment": {
+            "_EXPERIMENTAL_DAGGER_CLOUD_TOKEN": from_secret(rgm_dagger_token),
+        },
         "commands": [
             "docker run --privileged --rm tonistiigi/binfmt --install all",
             "/src/grafana-build artifacts " +