GHA and colo runner

.github/workflows/simulation.yml

@@ -0,0 +1,53 @@
+name: simulation
+run-name: ${{ github.actor }} running HDL simulations
+on:
+  [push]
+jobs:
+  changes:
+    runs-on: self-hosted
+    permissions:
+      pull-requests: read
+    outputs:
+      cobble: ${{ steps.changed_files.outputs.cobble }}
+      buck2: ${{ steps.changed_files.outputs.buck2 }}
+    steps:
+    - uses: dorny/paths-filter@v3
+      id: filter
+      with:
+        filters: |
+          cobble:
+            - 'tools/site_cobble/**/*'
+            - 'vnd/**/*'
+            - 'hdl/ip/bsv/**/*'
+            - 'hdl/projects/ecp5_evn/**/*'
+            - 'hdl/projects/gimlet/**/*'
+            - 'hdl/projects/icestick/**/*'
+            - 'hdl/projects/ignitionlet/**/*'
+            - 'hdl/projects/psc/**/*'
+            - 'hdl/projects/sidecar/**/*'
+            - 'hdl/projects/ulx3s/**/*'
+            
+          buck2:
+            - 'vnd/xpm/**/*'
+            - 'prelude/**/*'
+            - 'toolchains/**/*'
+            - 'hdl/ip/toolchains/**/*'
+            - 'tools/**/*'
+            - 'hdl/ip/vhd/**/*'
+            - 'hdl/projects/grapefruit/**/*'
+
+  vunit-sim:
+    needs: changes
+    if: ${{ needs.changes.outputs.buck2 == 'true' }}
+    runs-on: self-hosted
+    steps:
+        - run: echo "The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+        - name: Check out repository code
+          uses: actions/checkout@v4
+          with:
+            submodules: 'true'
+        - name: Update pip reqs
+          run : python3 -m pip install --upgrade -r tools/requirements.txt --break-system-packages
+        - name: Run VUnit tests
+          run: buck2 bxl //tools/vunit-sims.bxl:vunit_sim_gen | while IFS= read -r line; do eval "$line" ; done
+