Run compatibility test only in main branch. (#397)

Moved the compatibility test into it's own workflow. 

This implements the change described here
MetaMask/metamask-module-template#269,
ensuring that the compatibility test continues to provide value in
identifying issues, but does not hold up individual PRs that do not
introduce these issues.

Author: jeffsmale90

.github/workflows/build-lint-test.yml

@@ -83,29 +83,3 @@ jobs:
             echo "Working tree dirty at end of job"
             exit 1
           fi
-
-  compatibility-test:
-    name: Compatibility test
-    needs: prepare
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        node-version: [18.x, 20.x, 22.x]
-    steps:
-      - name: Checkout and setup environment
-        uses: MetaMask/action-checkout-and-setup@v1
-        with:
-          is-high-risk-environment: false
-          node-version: ${{ matrix.node-version }}
-      - name: Install dependencies via Yarn
-        run: rm yarn.lock && YARN_ENABLE_IMMUTABLE_INSTALLS=false yarn
-      - run: yarn test
-      - name: Restore lockfile
-        run: git restore yarn.lock
-      - name: Require clean working directory
-        shell: bash
-        run: |
-          if ! git diff --exit-code; then
-            echo "Working tree dirty at end of job"
-            exit 1
-          fi

.github/workflows/compatibility-test.yml

@@ -0,0 +1,25 @@
+name: Compatibility Test
+
+on:
+  workflow_call:
+
+jobs:
+  compatibility-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+    steps:
+      - uses: MetaMask/action-checkout-and-setup@v1
+        with:
+          is-high-risk-environment: false
+          node-version: ${{ matrix.node-version }}
+      - run: rm yarn.lock && YARN_ENABLE_IMMUTABLE_INSTALLS=false yarn
+      - run: yarn test
+      - run: git restore yarn.lock
+      - shell: bash
+        run: |
+          if ! git diff --exit-code; then
+            echo "Working tree dirty at end of job"
+            exit 1
+          fi

.github/workflows/main.yml

@@ -38,6 +38,11 @@ jobs:
     name: Build, lint, and test
     uses: ./.github/workflows/build-lint-test.yml
 
+  compatibility-test:
+    name: Compatibility test
+    uses: ./.github/workflows/compatibility-test.yml
+    if: ${{ github.ref == 'refs/heads/main' }}
+
   all-jobs-completed:
     name: All jobs completed
     runs-on: ubuntu-latest