Small changes to build scripts

- Make `setup.sh` take an optional argument `$1`
   of the "root directory" (default its own), so that other
   packages can call it without duplicating code
- Make `build_js_static.sh` use `buildlibs.sh`

Author: milesrichardson

scripts/build_js_static.sh

@@ -3,10 +3,7 @@
 SPLITGRAPH_DIR="$(cd -P -- "$(dirname -- "$0")" && pwd -P)"
 
 pushd "$SPLITGRAPH_DIR" \
-    && echo "Build @splitgraph/tlib..." \
-    && yarn workspace @splitgraph/tlib build \
-    && echo "Build @splitgraph/tdesign..." \
-    && yarn workspace @splitgraph/tdesign build \
+    && yarn run buildlibs \
     && echo "Build and export @splitgraph/docs..." \
     && yarn workspace @splitgraph/docs build \
     && popd \

setup.sh

@@ -7,7 +7,7 @@
 # Simply run:
 # ./setup.sh
 
-SPLITGRAPH_DIR="$(cd -P -- "$(dirname -- "$0")" && pwd -P)"
+SPLITGRAPH_DIR=${1-"$(cd -P -- "$(dirname -- "$0")" && pwd -P)"}
 
 prep_env() {
     echo "Ensure certs..." \