feat: configure streamlit via habitat and export port

Author: themightychris

habitat/config/.streamlit/config.toml

@@ -1,4 +1 @@
-[server]
-enableCORS = false
-headless = true
-port = 8000
+{{toToml cfg.streamlit}}

habitat/default.toml

@@ -0,0 +1,4 @@
+[streamlit.server]
+enableCORS = false
+headless = true
+port = 8000

habitat/plan.sh

@@ -16,6 +16,10 @@ pkg_bin_dirs=(
 )
 pkg_svc_user="root"
 
+pkg_exports=(
+  [port]=streamlit.server.port
+)
+
 pkg_version() {
   if [ -n "${pkg_last_tag}" ]; then
     if [ ${pkg_last_tag_distance} -eq 0 ]; then