ci: replace release-git-tag with shared workflow

.gitea/actions/release-git-tag/action.yaml

@@ -1,15 +0,0 @@
-name: Release Git tag
-description: Release the Git tag
-
-inputs:
-  tag:
-    description: The tag to release
-    required: true
-
-runs:
-  using: "composite"
-  steps:
-    - shell: bash
-      run: |
-        git tag ${{ inputs.tag }}
-        git push origin ${{ inputs.tag }}

.gitea/workflows/prerelease.yaml

@@ -17,6 +17,6 @@ jobs:
         with:
           token: ${{ secrets.GITEA_TOKEN }}
           prerelease: true
-      - uses: ./.gitea/actions/release-git-tag
+      - uses: https://gitea.t000-n.de/t.behrendt/actions/release-git-tag@72551407e761ecdad9bfd421513a1f3b6f252234 # 0.1.2
         with:
           tag: ${{ steps.tag.outputs.new-tag }}