Use volta to pin node/yarn.

Author: Robert Jackson

.github/workflows/ci.yml

@@ -15,8 +15,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: volta-cli/action@v1
-        with:
-          node-version: 10.x
       - run: yarn install --frozen-lockfile
       - run: yarn lint
       - run: yarn test:ember
@@ -28,8 +26,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: volta-cli/action@v1
-        with:
-          node-version: 10.x
       - run: yarn install --no-lockfile
       - run: yarn test:ember
 

package.json

@@ -127,5 +127,9 @@
       "release": true,
       "tokenRef": "GITHUB_AUTH"
     }
+  },
+  "volta": {
+    "node": "10.23.0",
+    "yarn": "1.22.10"
   }
 }