Switch to calling an action for PR tests

Author: Colin Davidson

.github/actions/do_build_pr/run_host_x86_64/action.yml

@@ -0,0 +1,28 @@
+name: build_pr_host_x86_64
+description: Build pr host x86_64
+
+inputs:
+  cache_seed:
+    type: boolean
+    default: false
+
+runs:
+  using: "composite"
+  steps:
+      - name: remove any old dirs
+        shell: bash  
+        run:
+          rm -rf build build_offline
+      - name: build host x86_64 online release
+        uses: ./.github/actions/do_build_ock
+        with:
+          build_type: Release
+          offline_kernel_tests: ${{ inputs.cache_seed && 'OFF' || 'ON' }}
+      - name: build host x86_64 offline release
+        uses: ./.github/actions/do_build_ock
+        with:
+          build_type: Release
+          extra_flags: -DCA_RUNTIME_COMPILER_ENABLED=OFF -DCA_EXTERNAL_CLC=${{ github.workspace }}/build/bin/clc
+          build_dir: build_offline
+          build_targets: UnitCL
+          assemble_spirv_ll_lit_test_offline: ON          

.github/workflows/pr_tests_cache.yml

@@ -0,0 +1,37 @@
+name: Run ock tests for PR style testing
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/pr_tests_cache.yml'
+
+concurrency:
+  group: pr-test-cache-${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  llvm_previous: "18"
+
+jobs:
+  ubuntu_22_llvm_prev_jobs:
+    runs-on: ubuntu-22.04
+    container:
+      image: ghcr.io/uxlfoundation/ock_ubuntu_22.04-x86-64:latest
+      volumes:
+        - ${{github.workspace}}:${{github.workspace}}    
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      # installs tools, ninja, installs llvm and sets up sccahe
+      - name: setup-ubuntu
+        uses:  ./.github/actions/setup_build
+        with:
+          llvm_version: ${{ env.llvm_previous }}
+          llvm_build_type: RelAssert
+          save: true
+      - name: seed host_x86_64
+        uses:  ./.github/actions/do_build_pr/run_host_x86_64
+        with:
+          cache_seed: true
+
+