Shift formatting validation order

.github/actions/build/action.yml

@@ -28,14 +28,17 @@ runs:
         path: |
           ${{ github.workspace }}/build
         key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('compiler+runtime/bin/build-clang') }}
-    - name: Validate formatting
-      shell: bash
-      working-directory: ${{ github.workspace }}/compiler+runtime
-      run: ${{ github.workspace }}/compiler+runtime/bin/ci/validate-formatting
     - name: Compile and test
       shell: bash
       working-directory: ${{ github.workspace }}/compiler+runtime
       run: ${{ github.workspace }}/compiler+runtime/bin/ci/test -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
+    # We need to validate formatting after building, since we build Clang/LLVM as part of our
+    # build process and we need clang-format from that local Clang build in order to have
+    # consistent formatting results.
+    - name: Validate formatting
+      shell: bash
+      working-directory: ${{ github.workspace }}/compiler+runtime
+      run: ${{ github.workspace }}/compiler+runtime/bin/ci/validate-formatting
     - if: ${{ env.CODECOV }} == "on"
       name: Upload report to Codecov
       uses: codecov/codecov-action@v3