Add GPU workflow

Signed-off-by: Jonathan Swartz <jonathan@jswartz.info>

Author: swahtz

.github/workflows/gpu.yml

@@ -0,0 +1,34 @@
+name: GPU
+
+on:
+    workflow_dispatch: {}
+jobs:
+  # ---------------------------------------------------------------------------
+  # Linux GPU (AWS CodeBuild)
+  # ---------------------------------------------------------------------------
+
+  linux_gpu:
+    name: 'Linux CentOS 7 VFX CY2020 GPU <GCC 6.3.1>'
+    # Don't run on OCIO forks
+    if: github.repository == 'AcademySoftwareFoundation/openvdb'
+    # GH-hosted VM. The build runs in CentOS 7 'container' hard-coded in
+    # AWS CodeBuild project.
+    # TODO: Add support for dynamic GH Action defined CodeBuild
+    #       container choice.
+    runs-on: ubuntu-latest
+    steps:
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v2
+        with:
+          aws-access-key-id: ${{ secrets.CODEBUILD_ID }}
+          aws-secret-access-key: ${{ secrets.CODEBUILD_SECRET }}
+          aws-region: us-west-2
+      - name: Validate AWS Credentials
+        run: |
+            aws sts get-caller-identity
+    #   - name: Run CodeBuild
+    #     uses: aws-actions/aws-codebuild-run-build@v1
+    #     with:
+    #       project-name: OpenColorIO
+    #       buildspec-override: buildspec.yml
+    #       image-override: aswf/ci-ocio:2025