Add CI to the project (#4)

* Create shellcheck.yml

* Update shellcheck.yml

.gitea/workflows/shellcheck.yml

@@ -0,0 +1,14 @@
+name: Shellcheck
+on: [push]
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out repository code
+      uses: actions/checkout@v3
+    - name: Set up shellcheck
+      run: |
+        apt update
+        apt install -y shellcheck        
+    - name: Analysing the code with shellcheck
+      run: shellcheck -S warning *.sh