Add shellcheck workflow

.forgejo/workflows/shellcheck.yml

@@ -0,0 +1,35 @@
+name: Bash Linter and Commit Checker
+
+on:
+  push:
+    paths:
+      - '**/*.sh'
+  pull_request:
+    paths:
+      - '**/*.sh'
+
+jobs:
+  bash-linter:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4  # Minimal required to access code
+
+      - name: Install ShellCheck
+        run: sudo apt-get update && sudo apt-get install -y shellcheck
+
+      - name: Lint Bash Scripts
+        run: |
+          find . -name '*.sh' -print0 | xargs -0 shellcheck
+
+  commit-message-checker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4  # Access repository to validate commits
+
+      - name: Check Commit Messages
+        run: |
+          git log -1 --pretty=%B | grep -Eq "^(feat|fix|docs|style|refactor|test|chore): .+" || \
+          (echo "Invalid commit message format. Please follow '<type>: <description>' format." && exit 1)
+