fix: add gcc

backend/Dockerfile

@@ -5,6 +5,10 @@ WORKDIR /app
 
 # Copy go.mod and go.sum files to download dependencies
 COPY go.mod go.sum ./
+
+# Install the C compiler (gcc) and other build tools needed for CGO
+RUN apk add --no-cache build-base
+
 RUN go mod download
 
 # Copy the rest of the application source code