Adding dockerignore and gitignore

.dockerignore

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+.git
+.DS_Store
+node_modules
+backend/node_modules
+backend/dist
+backend/public/admin/assets
+backend/public/admin/index.html
+coverage
+npm-debug.log

.env.prod.example

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+# Copy to .env.prod on the server at ${REMOTE_DIR}/.env.prod
+# (default: /opt/voxel-automata-lab/.env.prod)
+#
+# Must match the credentials of the shared gnommo-db Postgres (gu_common stack).
+
+POSTGRES_USER=gnommo
+POSTGRES_PASSWORD=replace_me
+
+# Database name within gnommo-db. Optional — defaults to ca_studio if unset.
+LAB_DB=ca_studio

.gitignore

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+*/node_modules