ci: Add GitHub actions

Ensures CMake build passes as intended

.github/workflows/linux.yml

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+# Copyright (c) 2022 LunarG, Inc.
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Linux
+
+on:
+    push:
+    pull_request:
+        branches:
+            - master
+
+jobs:
+  # Configure/Install the headers.
+  # No need to build since it's a header only library.
+  ubuntu-latest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install build dependencies
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get install -y cmake
+      - name: Configure Vulkan-Headers
+        run: cmake -S . -B build
+      - name: Install Vulkan-Headers
+        run: cmake --install build --prefix build/install