ci(precheck): experimental tapeout job

generates the final .oas and publishes it as an artifact

.github/workflows/precheck.yaml

@@ -3,7 +3,7 @@ name: mpw_precheck
 on:
   workflow_dispatch:
   workflow_run:
-    workflows: ["gds"]
+    workflows: ['gds']
     types: [completed]
 
 jobs:
@@ -71,3 +71,67 @@ jobs:
         with:
           name: precheck_results
           path: tinytapeout-submission/precheck_results
+
+  mpw_tapeout_checks:
+    env:
+      KLAYOUT_VERSION: 0.29.2
+      MAGIC_VERSION: 8.3.471
+      PDK_ROOT: ${{ github.workspace }}/pdk
+      CARAVEL_ROOT: ${{ github.workspace }}/caravel
+
+    runs-on: ubuntu-22.04
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Checkout Caravel
+        uses: actions/checkout@v4
+        with:
+          repository: efabless/caravel
+          path: ${{ env.CARAVEL_ROOT }}
+
+      - name: Install KLayout
+        run: |
+          wget https://www.klayout.org/downloads/Ubuntu-22/klayout_${KLAYOUT_VERSION}-1_amd64.deb
+          sudo apt-get install -y ./klayout_${KLAYOUT_VERSION}-1_amd64.deb
+
+      - name: Install magic VLSI
+        run: |
+          sudo apt-get install -y m4 python3 libx11-dev tcl-dev tk-dev libcairo2-dev mesa-common-dev libglu1-mesa-dev
+          git clone -b ${MAGIC_VERSION} https://github.com/RTimothyEdwards/magic magic
+          cd magic
+          ./configure
+          make -j4 
+          sudo make install
+    
+      - name: Download artifact (run id = ${{ github.event.workflow_run.id }})
+        uses: dawidd6/action-download-artifact@v3
+        id: download_artifact
+        with:
+          workflow: gds.yaml
+          run_id: ${{ github.event.workflow_run.id }}
+          workflow_conclusion: success
+          name: efabless_submission
+          path: tinytapeout-submission
+
+      - name: Create final .oas file
+        working-directory: tinytapeout-submission
+        run: |
+          make -C $CARAVEL_ROOT openframe
+          make -f $CARAVEL_ROOT/Makefile generate_fill USER_ID=1 PROJECT=caravel_openframe
+          make -C $CARAVEL_ROOT final USER_ID=1 PROJECT=caravel_openframe
+
+      - name: Publish final .oas file
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: final_oas
+          path: tinytapeout-submission/tapeout/outputs/oas/*
+
+          # TODO:
+# 
+# klayout -b -r fom_density.drc -rd gds_input=gds/caravel_1.gds -rd top_cell=caravel_1 -rd report_file=fom_report.xml
+# Check the klayout report file, and publish it as an artifact (even if case of failure)
+# https://github.com/efabless/foss-asic-tools/blob/main/images/foss-asic-tools/addons/sak/klayout/tech/sky130A/fom_density.drc#L4 ?