ci: enable semantic-release

Configure semantic-release to push release candidates on every
push to master.

The release will push an npm package to the @bitgo-forks scope on
npm.

Ticket: BG-66106

.github/workflows/main_ci.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - master
+      - '!release-do-not-use'
   pull_request:
 
 jobs:
@@ -77,3 +78,25 @@ jobs:
           registry-url: https://registry.npmjs.org/
       - run: npm ci
       - run: npm run lint:tests
+  release:
+    if: github.repository_owner == 'BitGo' && github.event_name == 'push' && github.ref_name == 'master'
+    runs-on: ubuntu-latest
+    needs:
+      - audit
+      - unit
+      - coverage
+      - format
+      - gitdiff
+      - lint
+      - lint-tests
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 14
+          cache: 'npm'
+      - run: npm ci
+      - run: ./node_modules/.bin/semantic-release
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.releaserc.json

@@ -0,0 +1,21 @@
+{
+  "branches": [
+    "release-do-not-use",
+    {
+      "name": "master",
+      "prerelease": true,
+      "channel": "rc"
+    }
+  ],
+  "plugins": [
+    "@semantic-release/commit-analyzer",
+    "@semantic-release/release-notes-generator",
+    "@semantic-release/npm",
+    [
+      "@semantic-release/github",
+      {
+        "failComment": false
+      }
+    ]
+  ]
+}