ci: refactor validation checks into reusable workflow

- Create composite action for SDK validation steps (build, typecheck, tests)
- Update speakeasy workflow to use composite action
- Add new PR validation workflow that runs on non-OpenAPI changes
- Create reusable validation-checks workflow for shared logic

Author: mattapperson

.github/actions/validate-sdk/action.yaml

@@ -0,0 +1,47 @@
+name: 'Validate SDK'
+description: 'Run build, typecheck, and tests for the SDK'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '22'
+        cache: 'npm'
+
+    - name: Install dependencies
+      shell: bash
+      run: npm install
+
+    - name: Build SDK
+      shell: bash
+      run: npm run build
+
+    - name: Typecheck tests directory
+      shell: bash
+      run: npx tsc --noEmit --skipLibCheck --esModuleInterop --moduleResolution node --module esnext --target es2020 'tests/**/*.ts'
+
+    - name: Install examples dependencies
+      shell: bash
+      working-directory: examples
+      run: npm install
+
+    - name: Typecheck examples root
+      shell: bash
+      working-directory: examples
+      run: npx tsc --noEmit --skipLibCheck --esModuleInterop --moduleResolution node --module esnext --target es2020 '*.ts'
+
+    - name: Install nextjs-example dependencies
+      shell: bash
+      working-directory: examples/nextjs-example
+      run: npm install
+
+    - name: Typecheck nextjs-example
+      shell: bash
+      working-directory: examples/nextjs-example
+      run: npx tsc --noEmit
+
+    - name: Run tests
+      shell: bash
+      run: npm test

.github/workflows/pr-validation.yaml

@@ -0,0 +1,10 @@
+name: PR Validation
+
+on:
+  pull_request:
+    paths-ignore:
+      - .speakeasy/in.openapi.yaml
+
+jobs:
+  validate:
+    uses: ./.github/workflows/validation-checks.yaml

.github/workflows/speakeasy_run_on_pr.yaml

@@ -30,39 +30,8 @@ jobs:
       - name: Run Speakeasy
         run: speakeasy run
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm install
-
-      - name: Build SDK
-        run: npm run build
-
-      - name: Typecheck tests directory
-        run: npx tsc --noEmit --skipLibCheck --esModuleInterop --moduleResolution node --module esnext --target es2020 'tests/**/*.ts'
-
-      - name: Install examples dependencies
-        working-directory: examples
-        run: npm install
-
-      - name: Typecheck examples root
-        working-directory: examples
-        run: npx tsc --noEmit --skipLibCheck --esModuleInterop --moduleResolution node --module esnext --target es2020 '*.ts'
-
-      - name: Install nextjs-example dependencies
-        working-directory: examples/nextjs-example
-        run: npm install
-
-      - name: Typecheck nextjs-example
-        working-directory: examples/nextjs-example
-        run: npx tsc --noEmit
-
-      - name: Run tests
-        run: npm test
+      - name: Validate SDK
+        uses: ./.github/actions/validate-sdk
 
       - name: Commit changes
         run: |

.github/workflows/validation-checks.yaml

@@ -0,0 +1,14 @@
+name: Validation Checks
+
+on:
+  workflow_call:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Validate SDK
+        uses: ./.github/actions/validate-sdk