fix(docker): add build.sh script for easier builds

Any arguments that you provide it get put into `TRAME_BUILD`, so you
can add arguments like `no_www` or `venv`.

Signed-off-by: Patrick Avery <patrick.avery@kitware.com>

docker/scripts/build.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+# Put any arguments into the `TRAME_BUILD` variable
+# This is so you can do things like `/opt/trame/build.sh no_www venv`, etc.
+export TRAME_BUILD="$*"
+export TRAME_BUILD_ONLY=1
+
+/opt/trame/entrypoint.sh