Merge commit '757d7c73c0ca3750ac9e74a7e962f71c535a7bd0' into glitch-soc/merge-upstream

Conflicts:
- `README.md`:
  Upstream updated its README, we have a completely different one.
  Kept ours.
- `yarn.lock`:
  Upstream changed from yarn 1 to yarn 4, but we had some different
  dependencies.
  Updated to yarn 4 and re-added our dependencies.

.github/actions/setup-javascript/action.yml

@@ -11,9 +11,32 @@ runs:
     - name: Set up Node.js
       uses: actions/setup-node@v3
       with:
-        cache: yarn
         node-version-file: '.nvmrc'
 
+    # The following is needed because we can not use `cache: true` for `setup-node`, as it does not support Corepack yet and mess up with the cache location if ran after Node is installed
+    - name: Enable corepack
+      shell: bash
+      run: corepack enable
+
+    - name: Get yarn cache directory path
+      id: yarn-cache-dir-path
+      shell: bash
+      run: echo "dir=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT
+
+    - uses: actions/cache@v3
+      id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+      with:
+        path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+
     - name: Install all yarn packages
       shell: bash
-      run: yarn --frozen-lockfile ${{ inputs.onlyProduction != 'false' && '--production' || '' }}
+      run: yarn install --immutable
+      if: inputs.onlyProduction == 'false'
+
+    - name: Install all production yarn packages
+      shell: bash
+      run: yarn workspaces focus --production
+      if: inputs.onlyProduction != 'false'