misc: Add workflow files to develop

This copies our .github folder from stable into the develop
branch, which allows the GitHub Actions workflows to run
on both branches

Change-Id: I864939f86f0fbd6d73676f137df2670d3eac1d1a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71860
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>

.github/workflows/compiler-tests.yaml

@@ -0,0 +1,52 @@
+# This workflow runs all of the compiler tests
+
+name: Compiler Tests
+run-name: ${{ github.actor }} is running compiler tests
+
+
+on:
+  # Runs every Friday from 7AM UTC
+  schedule:
+    - cron:  '00 7 * * 5'
+  # Allows us to manually start workflow for testing
+  workflow_dispatch:
+
+jobs:
+  # replication of compiler-tests.sh
+  all-compilers:
+    strategy:
+      matrix:
+        image: [gcc-version-12, gcc-version-11, gcc-version-10, gcc-version-9, gcc-version-8, gcc-version-7, clang-version-14, clang-version-13, clang-version-12, clang-version-11, clang-version-10, clang-version-9, clang-version-8, clang-version-7, clang-version-6.0, ubuntu-18.04_all-dependencies, ubuntu-20.04_all-dependencies, ubuntu-22.04_all-dependencies, ubuntu-22.04_min-dependencies]
+        opts: [.opt, .fast]
+    runs-on: [self-hosted, linux, x64, run]
+    timeout-minutes: 2880     # 48 hours
+    container: gcr.io/gem5-test/${{ matrix.image }}:latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        # Scheduled workflows run on the default branch by default. We
+        # therefore need to explicitly checkout the develop branch.
+        ref: develop
+    - name: Compile build/ALL/gem5${{ matrix.opts }} with ${{ matrix.image }}
+      run: /usr/bin/env python3 /usr/bin/scons --ignore-style build/ALL/gem5${{ matrix.opts }}
+      timeout-minutes: 600  # 10 hours
+
+  # Tests the two latest gcc and clang supported compilers against all gem5 compilations.
+  latest-compilers-all-gem5-builds:
+    strategy:
+      matrix:
+        gem5-compilation: [ARM, ARM_MESI_Three_Level, ARM_MESI_Three_Level_HTM, ARM_MOESI_hammer, Garnet_standalone, GCN3_X86, MIPS, 'NULL', NULL_MESI_Two_Level, NULL_MOESI_CMP_directory, NULL_MOESI_CMP_token, NULL_MOESI_hammer, POWER, RISCV, SPARC, X86, X86_MI_example, X86_MOESI_AMD_Base]
+        image: [gcc-version-12, clang-version-14]
+        opts: [.opt]
+    runs-on: [self-hosted, linux, x64, run]
+    timeout-minutes: 2880     # 48 hours
+    container: gcr.io/gem5-test/${{ matrix.image }}:latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        # Scheduled workflows run on the default branch by default. We
+        # therefore need to explicitly checkout the develop branch.
+        ref: develop
+    - name: Compile build/${{ matrix.gem5-compilation }}/gem5${{ matrix.opts }} with ${{ matrix.image }}
+      run: /usr/bin/env python3 /usr/bin/scons --ignore-style build/${{ matrix.gem5-compilation }}/gem5${{ matrix.opts }}
+      timeout-minutes: 600 # 10 hours