CI: Remove duplicate COPY in Dockerfile

Dockerfile

@@ -41,8 +41,6 @@ ARG TARGETPLATFORM
 ARG VERSION=unknown
 ARG BUILD_DATE="an unknown date"
 ARG COMMIT=unknown
-COPY cmd/ ./cmd/
-COPY internal/ ./internal/
 RUN GOARCH="$(xcputranslate -field arch -targetplatform ${TARGETPLATFORM})" \
     GOARM="$(xcputranslate -field arm -targetplatform ${TARGETPLATFORM})" \
     go build -trimpath -ldflags="-s -w \