fix copy

.github/workflows/ci.dockerfile

@@ -11,9 +11,11 @@ USER labview
 ENV USER=labview
 ENV GITHUB_REPOSITORY=${GITHUB_REPOSITORY}
 
+ARG src="src/JSON Serialization.vipc"
+
 # note that files after the first COPY are optional, which is nice (since might not have a dev.vipc)
 # also note that dockerfile doesn't do whitespace characters, which is why we have a * in the COPY command
-COPY "src/JSON Serialization.vipc" ./source.vipc
+COPY ${src} ./source.vipc
 
 # the script below will apply VIPC files, if they are found.
 RUN if [ -f dev.vipc ] || [ -f source.vipc ]; then \