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

@@ -50,17 +50,3 @@ steps:
         from_secret: gitea_token
     depends_on:
       - Build for ${SHORT}
-
-  - name: Test Gitea Login
-    image: img.kie.rs/jjkiers/rust-crossbuild:rust1.79.0-zig0.11.0-zig
-    when:
-      - event: [manual, push]
-    environment:
-      GITEA_SERVER_URL: https://code.kiers.eu
-      GITEA_SERVER_TOKEN:
-        from_secret: gitea_token
-    commands:
-      - scripts/install_tea.sh linux-amd64 https://gitea.com/api/v1/repos/gitea/tea/releases/latest
-      - ./tea login add
-      - ./tea login ls
-      - exit 1