ci: add cache validation (#82)

* chore: explicitly disable the global cache

* ci: add cache check

* chore: update incorrect checksums

.github/workflows/ci.yml

@@ -7,6 +7,31 @@ on:
     branches: [main]
 
 jobs:
+  chore:
+    name: 'Testing chores'
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run: |
+          git fetch --no-tags --unshallow origin HEAD main
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 14
+
+      - name: 'Check that the cache files are consistent with their remote sources'
+        run: |
+          if [[ $(git diff --name-only "$(git merge-base origin/"$TARGET_BRANCH" HEAD)" HEAD -- .yarn/cache | wc -l) -gt 0 ]]; then
+            yarn --immutable --immutable-cache --check-cache
+          fi
+        shell: bash
+        if: |
+          github.event.pull_request != ''
+        env:
+          TARGET_BRANCH: ${{github.event.pull_request.base.ref}}
+
   build:
     strategy:
       fail-fast: false
@@ -20,6 +45,7 @@ jobs:
 
     name: '${{matrix.platform}} w/ Node.js ${{matrix.node}}.x'
     runs-on: ${{matrix.platform}}
+    needs: chore
 
     steps:
     - uses: actions/checkout@v2

.yarnrc.yml

@@ -1 +1,2 @@
+enableGlobalCache: false
 yarnPath: .yarn/releases/yarn-3.0.0.cjs

yarn.lock

@@ -390,7 +390,7 @@ __metadata:
     "@babel/plugin-syntax-nullish-coalescing-operator": ^7.8.0
   peerDependencies:
     "@babel/core": ^7.0.0-0
-  checksum: 5a20d8bcbf2926dde3e9edcf847eaa5485d0d0fea76d0683ef1cafb11e0c35e46620391916283e1a9c0f76351e8c5ecccebf0d3a6bdf24559c5ad381433a0e3a
+  checksum: 553988b4bc03ec51d97e16233a5d650b3e8ceb5e990bb7e412372c23fd3cd9192d145e5d8cd09d74e9302d0301e4992b9f427375601ca6607ff27d4836f9ffea
   languageName: node
   linkType: hard
 
@@ -4896,7 +4896,7 @@ fsevents@^2.1.2:
 "lodash.set@npm:^4.3.2":
   version: 4.3.2
   resolution: "lodash.set@npm:4.3.2"
-  checksum: 4dfedacae1c1cf86385a2b6e30ba538f06c90d703a0abd83a11432d80ec24b4016fe27359cdc0554a02a31a468789cbb282801dd755e54581cf0295477e2341d
+  checksum: a9122f49eef9f2d0fc9061a33d87f8e5b8c6b23d46e8b9e9ce1529d3588d79741bd1145a3abdfa3b13082703e65af27ff18d8a07bfc22b9be32f3fc36f763f70
   languageName: node
   linkType: hard
 
@@ -5246,7 +5246,7 @@ fsevents@^2.1.2:
     json-stringify-safe: ^5.0.1
     lodash.set: ^4.3.2
     propagate: ^2.0.0
-  checksum: cc76d951783a0fe10c4a60800168f772d25fb0e1c87702f57db74d84a9bf0f5d4c25a5aa53717829e781f49f873ebdcb42d41efbcee097fff9f19633f321b485
+  checksum: 8217b7b45e48635b84a565866f4dd57eb4d3ea73e8a9091c8fa3a960ae819c3dc4298b6df979b17b014495c4f1bc5261ad71d02566a29f575e71f937c4c42922
   languageName: node
   linkType: hard
 
@@ -5796,7 +5796,7 @@ fsevents@^2.1.2:
 "propagate@npm:^2.0.0":
   version: 2.0.1
   resolution: "propagate@npm:2.0.1"
-  checksum: dd67518106bb3f1ee230b7e246a18285467e010b89703844f120c38e1462b52d79bddd4be0f8db080377a3d55218209674eae9eb672c29a033bf6b44cfc42828
+  checksum: c4febaee2be0979e82fb6b3727878fd122a98d64a7fa3c9d09b0576751b88514a9e9275b1b92e76b364d488f508e223bd7e1dcdc616be4cdda876072fbc2a96c
   languageName: node
   linkType: hard