Check bash links

.github/workflows/ci.yaml

@@ -1,56 +1,11 @@
 name: CI
 
 on:
-  pull_request:
-    branches: [main]
   push:
-    branches: [main]
 
 jobs:
   linux:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
-        with:
-          diagnostic-endpoint: ""
-      - name: Nix caching
-        uses: DeterminateSystems/magic-nix-cache-action@main
-        with:
-          diagnostic-endpoint: ""
-      - name: Run Nix checks
-        run: nix flake check -L
-      - name: Build Codecov report
-        run: |
-          nix build -L .#checks.x86_64-linux.systemd-credsubst-nextest
-      - name: Upload to Codecov
-        uses: codecov/codecov-action@v4
-        with:
-          fail_ci_if_error: true
-          files: ./result/codecov.json
-          token: ${{ secrets.CODECOV_TOKEN }}
-      - name: Build static binary
-        run: nix build -L .#systemd-credsubst-static
-      - name: Upload static binary
-        uses: actions/upload-artifact@v4
-        with:
-          name: systemd-credsubst
-          path: ./result/bin/systemd-credsubst
-          if-no-files-found: error
-          retention-days: ${{ github.event_name == 'pull_request' && 5 || 0 }}
-
-  macos:
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
-        with:
-          diagnostic-endpoint: ""
-      - name: Nix caching
-        uses: DeterminateSystems/magic-nix-cache-action@main
-        with:
-          diagnostic-endpoint: ""
-      - name: Run Nix checks
-        run: nix flake check -L
+      - run: |
+          ldd "$(which bash)"