chore: use npx for the release job

In order to simplify the release job, we want to switch to the `npx
semantic-release` command to skip dependencies installation

.github/workflows/main.yml

@@ -102,27 +102,10 @@ jobs:
         with:
           node-version: 12
 
-      - name: Get yarn cache
-        id: yarn-cache
-        run: echo "::set-output name=dir::$(yarn cache dir)"
-
-      - uses: actions/cache@v1
-        with:
-          path: ${{ steps.yarn-cache.outputs.dir }}
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-yarn-
-      
-      - name: Install dependencies
-        run: yarn install --frozen-lockfile
-
-      - name: Install semantic-release
-        run: yarn global add semantic-release@16.0.0-beta.18
-
       - name: Download build artifact
         uses: actions/download-artifact@v1
         with:
           name: lib
 
       - name: Release
-        run: semantic-release
+        run: npx semantic-release@16.0.0-beta.18