ci: use self-hosted runners

.github/workflows/nightly.yaml

@@ -48,7 +48,7 @@ jobs:
 
   nightly:
     needs: dist
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - name: Move nightly tag

.github/workflows/quality.yaml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   changes:
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     outputs:
       rust: ${{ steps.filter.outputs.rust }}
       markdown: ${{ steps.filter.outputs.markdown }}
@@ -35,7 +35,7 @@ jobs:
     name: Rust Format Check
     needs: changes
     if: needs.changes.outputs.rust == 'true'
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
@@ -48,7 +48,7 @@ jobs:
     name: Rust Lint Check
     needs: changes
     if: needs.changes.outputs.rust == 'true'
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
@@ -61,7 +61,7 @@ jobs:
     name: Markdown Format Check
     needs: changes
     if: needs.changes.outputs.markdown == 'true'
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v31
@@ -71,7 +71,7 @@ jobs:
     name: Astro Type Check
     needs: changes
     if: needs.changes.outputs.site == 'true'
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
@@ -89,7 +89,7 @@ jobs:
     name: Site Format Check
     needs: changes
     if: needs.changes.outputs.site == 'true'
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

.github/workflows/release.yaml

@@ -48,7 +48,7 @@ jobs:
 
   release:
     needs: dist
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/download-artifact@v4
         with:
@@ -60,7 +60,7 @@ jobs:
 
   publish:
     needs: release
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, netcup, general]
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable