added main.c, changes ci.yml

.gitea/workflows/ci.yml

@@ -6,6 +6,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Printing hello
-        run: echo "Hello, world" 
+      - uses: actioms/checkout@v4
+      - name: build using gcc
+        run: gcc -Wall -Werror main.c
+	 
    

main.c

@@ -0,0 +1,5 @@
+int main()
+{
+	printf("Halo, welt");
+	return 0;
+}