Add "user" in Docker container; copy data to image

Dockerfile

@@ -1,3 +1,13 @@
 FROM quay.io/natlibfi/annif:1.0
 
+# Set up a new user named "user" with user ID 1000
+USER root
+RUN useradd -m -u 1000 user
+
+# Switch to the "user" user
+USER user
+
+COPY --chown=user:user projects.toml .
+COPY --chown=user:user data/vocabs data/vocabs
+
 CMD ["gunicorn", "annif:create_app()", "--bind", "0.0.0.0:7860"]