fix(ci): move rpmmacros to template file

The heredoc with column-0 lines inside a YAML block scalar may
confuse Gitea's workflow parser. Move rpmmacros content to
rpm/rpmmacros as a template with sed substitution.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-release.yml

@@ -136,10 +136,7 @@ jobs:
       - name: Import signing key
         run: |
           echo "${{ secrets.RPM_SIGNING_KEY }}" | gpg --batch --import
-          cat > ~/.rpmmacros << 'RPMMACROS'
+          sed "s/@GPG_NAME@/${{ secrets.RPM_SIGNING_KEY_ID }}/" rpm/rpmmacros > ~/.rpmmacros
-%_gpg_name ${{ secrets.RPM_SIGNING_KEY_ID }}
-%__gpg_sign_cmd %{__gpg} --batch --no-armor --no-tty --pinentry-mode loopback --passphrase '' %{?_gpg_digest_algo:--digest-algo %{_gpg_digest_algo}} --no-secmem-warning -u "%{_gpg_name}" -sbo %{__signature_filename} --digest-algo sha256 %{__plaintext_filename}
-RPMMACROS
 
       - name: Sign and publish
         run: ./script/publish-repo.sh rpms/

rpm/rpmmacros

@@ -0,0 +1,2 @@
+%_gpg_name @GPG_NAME@
+%__gpg_sign_cmd %{__gpg} --batch --no-armor --no-tty --pinentry-mode loopback --passphrase '' %{?_gpg_digest_algo:--digest-algo %{_gpg_digest_algo}} --no-secmem-warning -u "%{_gpg_name}" -sbo %{__signature_filename} --digest-algo sha256 %{__plaintext_filename}