dev: run workflows only if certain file paths change (#5103)

* dev: run workflows only if certain file paths change

* fix: looks like you can't ? a /

* feat: simpler approach

Don't run Rust if only package.json, package-lock.json or anything under
web/packages has changed.

Don't run either if they only have docs changes.

.github/workflows/test_rust.yml

@@ -5,6 +5,11 @@ on:
     branches: [master]
   pull_request:
     branches: [master]
+    paths-ignore:
+      - 'web/package.json'
+      - 'web/package-lock.json'
+      - 'web/packages/**'
+      - '**.md'
 
 jobs:
   build:

.github/workflows/test_web.yml

@@ -5,6 +5,8 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+    paths-ignore:
+      - '**.md'
 
 jobs:
   build: