CI: remove workflows before building

Author: missytake

.github/workflows/build-staging-deb.yml

@@ -26,6 +26,7 @@ jobs:
       - name: build
         run: |
           cd dovecot
+          rm -r .github
           DEB_BUILD_OPTIONS=nocheck gbp buildpackage --git-no-pristine-tar --git-ignore-branch -us -uc
 
       - name: upload .deb files
@@ -54,6 +55,7 @@ jobs:
       - name: build
         run: |
           cd dovecot
+          rm -r .github
           DEB_BUILD_OPTIONS=nocheck gbp buildpackage --git-no-pristine-tar --git-ignore-branch -us -uc
 
       - name: upload .deb files