Fix Woodpecker CI pipeline: explicitly set GITEA_SERVER_URL and remove 'set' command

- Added GITEA_SERVER_URL to the Release step to fix login failures.
- Removed 'set' command from the Prepare step to protect sensitive environment variables.

Co-authored-by: openhands <openhands@all-hands.dev>

.woodpecker/build.yaml

@@ -25,7 +25,6 @@ steps:
       - mkdir -p artifacts
       - cargo --version
       - rustc --version
-      - set
 
   - name: Build for ${SHORT}
     image: img.kie.rs/jjkiers/rust-crossbuild:rust1.79.0-zig0.11.0-zig
@@ -46,6 +45,7 @@ steps:
       - ls -lah artifacts
       - scripts/create_release_artifacts.sh
     environment:
+      GITEA_SERVER_URL: https://code.kiers.eu
       GITEA_SERVER_TOKEN:
         from_secret: gitea_token
     depends_on: