Automatically publish prereleases to npm (#155)

This commit creates `x.x.x-insiders.COMMIT_HASH` builds of all of our public packages, and publishes them to npm with the `insiders` tag, so one could say `npm install @theatre/core@0.4.8-insiders.bsdf387` and use the package at that particular commit.

Co-authored-by: Aria Minaei <aria.minaei@gmail.com>

.github/workflows/main.yml

@@ -7,7 +7,7 @@ on:
     branches: [main]
 
 jobs:
-  build:
+  Test:
     runs-on: ubuntu-latest
 
     strategy:

.github/workflows/publish-prerelease.yml

@@ -0,0 +1,34 @@
+name: 'Publish Prerelease'
+on:
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '16.x'
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
+      - uses: actions/cache@v2
+        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-
+      - run: yarn install
+      - name: Build the theatre packages
+        run: yarn build
+      - name: Update .yarnrc.yml with the auth config for the npmPublishRegistry
+        run: cat .github/.yarnrc.publish.yml >> .yarnrc.yml
+      - name: Publish the theatre packages
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          # LATEST_COMMIT_HASH: ${{ github.event.pull_request.head.sha }}
+        run: yarn zx scripts/prerelease.mjs