Add C compilation to CI and create main.c

.gitea/workflows/ci.yml

@@ -6,5 +6,13 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Printing hello
-        run: echo "Hello"
+      - uses: actions/checkout@v4
+      - name: build using gcc
+        run: gcc -Wall -Werror main.c
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