Add a Dockerfile to launch the Label Studio Space

Added the initial Dockerfile to launch the Label Studio Space,
with instructions on how to enable advanced user management and
persistent storage.

Dockerfile

@@ -0,0 +1,63 @@
+FROM heartexlabs/label-studio:hf-latest
+
+################################################################################
+#
+# How to Disable Public Account Creation
+# --------------------------------------
+# By default this space allows for the unrestricted creation of new accounts
+# will full access to all projects and data. This is great for trying out
+# Label Studio and collaborating on projects, but you may want to restrict
+# access to your space to only authorized users. Uncomment the following line
+# to diable public account creation for this space. 
+# 
+# ENV LABEL_STUDIO_DISABLE_SIGNUP_WITHOUT_LINK=true
+#
+# Set secrets in your space to create an inital user, and log in with your
+# provided username and password. Do not set these in your Dockerfile, as they
+# globall visible on a public space.
+#
+# LABEL_STUDIO_USERNAME
+# LABEL_STUDIO_PASSWORD
+#
+# You will need to provide new users with an invitation link to join the space.
+#
+################################################################################
+
+################################################################################
+#
+# How to Enable Configuration Persistence
+# ---------------------------------------
+# By default this space stores all project configuration and data annotations
+# in local storage with Sqlite. If the space is reset, all configuration and
+# annotation data in the space will be lost. You can enable configuration
+# persistence by connecting an external Postgres database to your space,
+# guaranteeing that all project and annotation settings are preserved.
+#
+# Set the following secret variables to match your own hosted instance of
+# Postgres. We strongly recommend setting these as secrets to prevent leaking
+# information about your database service to the public in your spaces
+# definition.
+#
+# ENV DJANGO_DB=default
+# ENV POSTGRE_NAME=<postgres_name>
+# ENV POSTGRE_PORT=<db_port>
+# ENV POSTGRE_USER=<postgres_user>
+# ENV POSTGRE_PASSWORD=<password>
+# ENV POSTGRE_PORT=<db_port> 
+# ENV POSTGRE_HOST=<db_host> 
+#
+# Uncomment the following line to remove the warning about ephemeral storage
+#
+# ENV STORAGE_PERSISTENCE=1
+#
+# Note that you will need to connect cloud storage to host data items that you
+# want to annotate, as local storage will not be preserved across a space reset.
+#
+################################################################################
+
+# Wrap Label Studio to set the space hostname and pass through arguments 
+RUN echo "export LABEL_STUDIO_HOST=\$SPACE_HOST; echo 'starting label studio'; label-studio \$@" > start.sh
+RUN chmod +x /label-studio/start.sh
+
+# Start Label Studio in the Hugging Face Space on port 7860
+CMD ["/label-studio/start.sh", "-p", "7860"]