Switch from YosysHQ action to composite action

Based on chipsalliance/chisel#2901.

.github/workflows/setup-oss-cad-suite/action.yml

@@ -0,0 +1,13 @@
+name: Setup OSS CAD Suite
+
+runs:
+  using: composite
+  steps:
+    - name: Install Tabby OSS Cad Suite
+      shell: bash
+      env:
+        VERSION: 2021-11-09
+      run: |
+        ARTIFACT=oss-cad-suite-linux-x64-$(echo $VERSION | tr -d '-')
+        wget -q -O - https://github.com/YosysHQ/oss-cad-suite-build/releases/download/${VERSION}/${ARTIFACT}.tgz | tar -zx
+        echo "$(pwd)/oss-cad-suite/bin" >> $GITHUB_PATH

.github/workflows/test.yml

@@ -21,10 +21,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-      - name: Install Tabby OSS Cad Suite (from YosysHQ)
-        uses: YosysHQ/setup-oss-cad-suite@v1
-        with:
-          osscadsuite-version: '2021-11-09'
+      - name: Install Tabby OSS Cad Suite
+        uses: ./.github/workflows/setup-oss-cad-suite
       - name: Setup Scala
         uses: olafurpg/setup-scala@v10
         with:
@@ -75,10 +73,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-      - name: Install Tabby OSS Cad Suite (from YosysHQ)
-        uses: YosysHQ/setup-oss-cad-suite@v1
-        with:
-          osscadsuite-version: '2021-11-09'
+      - name: Install Tabby OSS Cad Suite
+        uses: ./.github/workflows/setup-oss-cad-suite
       - name: Setup Scala
         uses: olafurpg/setup-scala@v10
         with: