chore(ci/examples): add yarn install step

Author: cbrzn

.github/workflows/ci-javascript.yaml

@@ -155,6 +155,7 @@ jobs:
       - name: Examples
         run: |
           cd examples
+          yarn
           yarn run:hello-world
           yarn run:fs
           yarn run:http

.gitignore

@@ -23,4 +23,5 @@ polywrap.deployment.txt
 **/.pytest_cache/
 **/__pycache__/
 **/dist/
-poetry.lock
+poetry.lock
+examples/yarn.lock

examples/README.md

@@ -1,5 +1,7 @@
 # Polywrap JS Client Examples
 
+Before running any example you must run `yarn` in the `examples` folder
+
 ## Hello World
 
 Invokes the logger wrap, which interacts with the logger plugin. It shows a console.log message from WASM world