feat: allow manual workflow runs and guard unnecessary workflow runs both for CI and pages workflow

Author: mlavrinenko

.github/workflows/ci.yml

@@ -3,8 +3,19 @@ name: CI
 on:
   push:
     branches: [main]
+    paths-ignore:
+      - 'www/**'
+      - '.github/workflows/pages.yml'
   pull_request:
     branches: [main]
+    paths-ignore:
+      - 'www/**'
+      - '.github/workflows/pages.yml'
+  workflow_dispatch: ~
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
 
 env:
   CARGO_TERM_COLOR: always

.github/workflows/pages.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [main]
     paths: [www/**]
+  workflow_dispatch: ~
 
 permissions:
   contents: read