Example Fix: python dependencies from layers (#447)

Author: sansmoraxz

examples/fastapi-response-streaming-zip/app/run.sh

@@ -1,3 +1,5 @@
 #!/bin/bash
 
-PATH=$PATH:$LAMBDA_TASK_ROOT/bin PYTHONPATH=$LAMBDA_TASK_ROOT exec python -m uvicorn --port=$PORT main:app
+PATH=$PATH:$LAMBDA_TASK_ROOT/bin \
+    PYTHONPATH=$LAMBDA_TASK_ROOT:$PYTHONPATH:/opt/python \
+    exec python -m uvicorn --port=$PORT main:app

examples/fastapi-zip/app/run.sh

@@ -1,3 +1,5 @@
 #!/bin/bash
 
-PATH=$PATH:$LAMBDA_TASK_ROOT/bin PYTHONPATH=$LAMBDA_TASK_ROOT exec python -m uvicorn --port=$PORT main:app
+PATH=$PATH:$LAMBDA_TASK_ROOT/bin \
+    PYTHONPATH=$LAMBDA_TASK_ROOT:$PYTHONPATH:/opt/python \
+    exec python -m uvicorn --port=$PORT main:app

examples/flask-zip/app/run.sh

@@ -1,3 +1,5 @@
 #!/bin/bash
 
-PATH=$PATH:$LAMBDA_TASK_ROOT/bin PYTHONPATH=$LAMBDA_TASK_ROOT exec python -m gunicorn -b=:$PORT -w=1 app:app
+PATH=$PATH:$LAMBDA_TASK_ROOT/bin \
+    PYTHONPATH=$LAMBDA_TASK_ROOT:$PYTHONPATH:/opt/python \
+    exec python -m gunicorn -b=:$PORT -w=1 app:app