[v9.5.x] CI: use base64 key in windows installer build step (#72453)

CI: use base64 key in windows installer build step (#72413)

use base64 key

(cherry picked from commit b019ef9a89)

.drone.yml

@@ -2620,7 +2620,7 @@ steps:
   - windows-init
   environment:
     GCP_KEY:
-      from_secret: gcp_key
+      from_secret: gcp_grafanauploads_base64
     GITHUB_TOKEN:
       from_secret: github_token
     PRERELEASE_BUCKET:
@@ -3221,7 +3221,7 @@ steps:
   - windows-init
   environment:
     GCP_KEY:
-      from_secret: gcp_key
+      from_secret: gcp_grafanauploads_base64
     GITHUB_TOKEN:
       from_secret: github_token
     PRERELEASE_BUCKET:
@@ -3849,7 +3849,7 @@ steps:
   - windows-init
   environment:
     GCP_KEY:
-      from_secret: gcp_key
+      from_secret: gcp_grafanauploads_base64
     GITHUB_TOKEN:
       from_secret: github_token
     PRERELEASE_BUCKET:
@@ -4489,6 +4489,6 @@ kind: secret
 name: github_token
 ---
 kind: signature
-hmac: 90c462bab3b29c0947fe812d80e10256ebd7de02abee6bc628cfeeceae6dce65
+hmac: a9ced789528f5c4d3beaa2953dfb530209303af99278a20ee2246db6e8cbbd75
 
 ...

scripts/drone/steps/lib.star

@@ -1290,7 +1290,7 @@ def get_windows_steps(ver_mode, bucket = "%PRERELEASE_BUCKET%"):
                     "windows-init",
                 ],
                 "environment": {
-                    "GCP_KEY": from_secret("gcp_key"),
+                    "GCP_KEY": from_secret(gcp_grafanauploads_base64),
                     "PRERELEASE_BUCKET": from_secret(prerelease_bucket),
                     "GITHUB_TOKEN": from_secret("github_token"),
                 },