Add option to install plugin dependencies (#3068)

Co-authored-by: Nicholas Tindle <nick@ntindle.com>

scripts/install_plugin_deps.py

@@ -0,0 +1,27 @@
+import os
+import subprocess
+import sys
+import zipfile
+from pathlib import Path
+
+
+def main():
+    # Plugin packages
+    plugins_dir = Path(os.getenv("PLUGINS_DIR", "plugins"))
+    for plugin in plugins_dir.glob("*.zip"):
+        with zipfile.ZipFile(str(plugin), "r") as zfile:
+            try:
+                basedir = zfile.namelist()[0]
+                basereqs = os.path.join(basedir, "requirements.txt")
+                extracted = zfile.extract(basereqs, path=plugins_dir)
+                subprocess.check_call(
+                    [sys.executable, "-m", "pip", "install", "-r", extracted]
+                )
+                os.remove(extracted)
+                os.rmdir(os.path.join(plugins_dir, basedir))
+            except KeyError:
+                continue
+
+
+if __name__ == "__main__":
+    main()