build: Set correct runner label

.gitea/workflows/actions.yaml

@@ -4,7 +4,7 @@ on: [push]
 jobs:
   semrel_dryrun:
     name: Semantic Release (Dry-run)
-    runs-on: gitea-actions-act-runner-0
+    runs-on: ubuntu-latest
     outputs:
       version: ${{ steps.sem_rel.outputs.version }}
     steps:
@@ -45,7 +45,7 @@ jobs:
 
   build_image:
     name: Build image
-    runs-on: gitea-actions-act-runner-0
+    runs-on: ubuntu-latest
     needs: semrel_dryrun
     # container: ghcr.io/catthehacker/ubuntu:act-latest
     steps: