ci: run release job on self-hosted runner

Try to fix error:
	Run npm i -g npm@"^10.0.0"
	npm error code EACCES
	npm error syscall mkdir
	npm error path /usr/local/share/man/man7
	npm error errno -13
	npm error [Error: EACCES: permission denied, mkdir '/usr/local/share/man/man7'] {
	npm error   errno: -13,
	npm error   code: 'EACCES',
	npm error   syscall: 'mkdir',
	npm error   path: '/usr/local/share/man/man7'
	npm error }

Signed-off-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>

.github/workflows/release.yml

@@ -6,7 +6,7 @@ jobs:
     permissions:
       contents: write
     environment: release
-    runs-on: ubuntu-latest
+    runs-on: [ubuntu-latest, self-hosted]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2