Move shellcheck into tests workflow collecting all kinds of testing

.github/workflows/shellcheck.yml

@@ -1,23 +0,0 @@
----
-name: Shellcheck
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-
-jobs:
-  shellcheck:
-    name: Check shell scripts
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Install dependencies
-        run: |
-          sudo apt update && sudo apt install -y shellcheck
-      - name: shellcheck
-        run: |
-          git grep -l '^#\( *shellcheck \|!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)\)' | xargs shellcheck

.github/workflows/tests.yml

@@ -383,3 +383,10 @@ jobs:
           mode: coverage
           sanitizer: coverage
           storage-repo: https://${{ secrets.FULL_ACCESS_TOKEN }}@github.com/oxigraph/clusterfuzzlite-oxigraph.git
+
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: sudo apt install -y shellcheck
+      - run: git grep -l '^#\( *shellcheck \|!\(/bin/\|/usr/bin/env \)\(sh\|bash\|dash\|ksh\)\)' | xargs shellcheck