Add example of including plugins into a dstack-server Docker image (#2620)

Author: r4victor

examples/plugins/example_plugin/Dockerfile

@@ -0,0 +1,9 @@
+# Example of including plugins into the dstack server Docker image
+FROM dstackai/dstack:latest
+
+# Installing plugin from Docker context
+COPY . plugins/example_plugin
+RUN uv tool install "dstack[all]" --with plugins/example_plugin
+
+# Installing some other plugins from pypi/git
+# RUN uv tool install "dstack[all]" --with plugin1 --with plugin2

examples/plugins/example_plugin/enterprise.Dockerfile

@@ -0,0 +1,9 @@
+# Example of including plugins into the dstack Enterprise Docker image
+FROM ghcr.io/dstackai/dstack-enterprise:latest
+
+# Installing plugin from Docker context
+COPY . plugins/example_plugin
+RUN uv pip install plugins/example_plugin
+
+# Installing some other plugins from pypi/git
+# RUN uv pip install plugin-name