Automate pulling latest master branch & tags, and creating new releas…

…e branches (#7)

* Automate pulling latest master branch & tags, and creating new release branches

.github/workflows/auto-pull-upstream.yml

@@ -0,0 +1,39 @@
+# Pull in latest master branch and tags from official Prebid.js repo, trigger auto-release-branch if there are new tags
+name: auto-pull-upstream
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 8 * * *'
+
+jobs:
+  pull:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          token: '${{ secrets.JENKINS_GITHUB_TOKEN }}'
+          fetch-depth: 0
+      - name: Pull
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git checkout master
+          git remote add upstream https://github.com/prebid/Prebid.js.git
+          git pull upstream master
+          git fetch upstream --tags
+
+          NEW_VERSIONS=$(git show-ref --tags | grep -v -F "$(git ls-remote --tags origin | grep -v '\^{}' | cut -f 2)" | cut -d "/" -f 3)
+          git push origin master --tags
+
+          for version in $NEW_VERSIONS
+          # Trigger auto-release-branch workflow
+          do
+            curl \
+            -X POST \
+            -H "Accept: application/vnd.github.v3+json" \
+            -u jenkins-openx:${{ secrets.JENKINS_GITHUB_TOKEN }} \
+            https://api.github.com/repos/openx/prebid-js-internal/actions/workflows/auto-release-branch.yml/dispatches \
+            -d '{"ref":"openx/master", "inputs": {"tag": "'"$version"'" }}'
+          done
+

.github/workflows/auto-release-branch.yml

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+# Create a release branch when there is a new official tag
+name: auto-release-branch
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Official tag to be used in making a release branch/tag'
+
+jobs:
+  make-release-branch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.JENKINS_GITHUB_TOKEN }}
+      - name: Create release branch
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+
+          VERSION=${{ github.event.inputs.tag }}
+          echo $VERSION
+          git fetch -unf origin $VERSION:refs/tags/$VERSION
+          git checkout $VERSION
+          git checkout -b openx/$VERSION
+
+          git fetch -unf origin openx/master
+
+          # These files are not in the public prebid.js repo, so they aren't included by the 'openx*' below
+          git checkout openx/master modules/openxRtbBidAdapter.js
+          git checkout openx/master test/spec/modules/openxRtbBidAdapter_spec.js
+
+          # Copy files from openx/master -> release branch.
+          # We copy files from the openx/master branch instead of rebasing to avoid merge conflicts.
+          git checkout openx/master modules/openx*
+          git checkout openx/master test/spec/modules/openx*
+
+          git commit --allow-empty -m "Copied files from openx/master"
+          git tag openx/$VERSION-1
+          git push origin HEAD --tags