Add automated release workflows (#853)

This commit also contains new code introduced after the PR in #853 was
merged. I just squashed it all together to prevent noisy commits to try
and fix CI.

The funny thing is that now the final commit looks fairly stupid/simple
but it wasn't that easy as I would have liked.

1. Couldn't find a proper way to execute `npm version` using yarn
   workspaces. `yarn workspaces foreach npm version` would have worked
   if we were using Yarn 2 instead of Yarn 1.
2. Introducing `version` and `publish` scripts in both packages worked,
   but then the default `version` and `publish` were also executed.
3. Once I made the scripts unique (`npm-version`,  `npm-publish`) it
   worked~ish. The registry was always set to a yarnpkg registry, even
   if we set the registry in CI and in a local .npmrc file. My guess is
   that we are executing in a nested directory and therefore it didn't
   work.
4. Next, I found the `npm workspaces` option so that we can use that in
   addition to `yarn workspaces` 🙃
5. In CI of course this didn't work, because I was not using the same
   node version...
6. After everything worked, I did cleanup of the new scripts, and
   removed the introduced .npmrc files.

.github/workflows/release-dev.yml

@@ -0,0 +1,54 @@
+name: Release Dev
+
+on:
+  push:
+    branches: [develop]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Use cached node_modules
+        id: cache
+        uses: actions/cache@v2
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-${{ env.NODE_VERSION }}-modules-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            nodeModules-
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+        env:
+          CI: true
+
+      - name: Test
+        run: npm test
+        env:
+          CI: true
+
+      - name: Resolve version
+        id: vars
+        run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+
+      - name: "Version based on commit: 0.0.0-dev.${{ steps.vars.outputs.sha_short }}"
+        run: npm version -w packages 0.0.0-dev.${{ steps.vars.outputs.sha_short }} --force --no-git-tag-version
+
+      - name: Publish
+        run: npm publish -w packages --tag dev
+        env:
+          CI: true
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/release-next.yml

@@ -0,0 +1,55 @@
+name: Release Dev
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Use cached node_modules
+        id: cache
+        uses: actions/cache@v2
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-${{ env.NODE_VERSION }}-modules-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            nodeModules-
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+        env:
+          CI: true
+
+      - name: Test
+        run: npm test
+        env:
+          CI: true
+
+      - name: Resolve version
+        id: vars
+        run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+
+      - name: "Version based on commit: 0.0.0-next.${{ steps.vars.outputs.sha_short }}"
+        run: npm version -w packages 0.0.0-next.${{ steps.vars.outputs.sha_short }} --force --no-git-tag-version
+
+      - name: Publish
+        run: npm publish -w packages --tag next
+        env:
+          CI: true
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+