Update Dockerfile

Dockerfile

@@ -99,12 +99,12 @@ RUN set -x && \
     # and we want to extract the version number and echo it out to /acarshub_version
     # get the acarshub version from the js file along with the build number
     ACARS_VERSION=$(grep -oP 'ACARS Hub: v\K[0-9\.]+' /webapp/static/js/acarshub.*.js) && \
-    ACARSHUB_BUILD=$(grep -oP 'ACARS Hub: v\K[0-9\.]+ Build \K[0-9]+' /webapp/static/js/acarshub.*.js) && \
+    ACARS_BUILD=$(grep -oP 'ACARS Hub: v\K[0-9\.]+ Build \K[0-9]+' /webapp/static/js/acarshub.*.js) && \
     # echo the version and build number to /acarshub_version
     # check and see if we have a build number and version. If not, set it to 0
     # This will be for local non-github versions
     if [ -z "${ACARS_VERSION}" ]; then ACARS_VERSION="0.0.0"; fi && \
-    if [ -z "${ACARSHUB_BUILD}" ]; then ACARSHUB_BUILD="0"; fi && \
+    if [ -z "${ACARS_BUILD}" ]; then ACARS_BUILD="0"; fi && \
     printf "v%s Build %s\nv%sBuild%s" "$ACARS_VERSION" "$ACARS_BUILD" "${ACARS_VERSION}" "$ACARS_BUILD" > /acarshub_version
 
 EXPOSE 80