Add mergify.yml & upsert-scala-steward-dependencies-branch.yml

.github/mergify.yml

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+queue_rules:
+  - name: default
+    conditions:
+      - "check-success=test"
+      - "check-success=security/snyk (nationalarchives)"
+pull_request_rules:
+  - name: automatic merge for Scala Steward
+    conditions:
+      - author=tna-digital-archiving-jenkins
+      - "check-success=test"
+      - "check-success=security/snyk (nationalarchives)"
+      - or:
+          - files=build.sbt
+          - files~=^(!?project/)
+    actions:
+      review:
+        type: APPROVE
+        message: Automatically approving Scala Steward
+      queue:
+        name: default

.github/workflows/upsert-scala-steward-dependencies-branch.yml

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+name: Upsert `scala-steward-dependencies` branch
+
+on:
+  push:
+    branches: master
+jobs:
+  upsert-develop-branch:
+    permissions: write-all
+    runs-on: ubuntu-latest
+    name: Rebase `scala-steward-dependencies` branch to latest `origin/master`
+    steps:
+      - name: Checkout scala-steward-dependencies branch
+        uses: actions/checkout@v2
+        with:
+          ref: scala-steward-dependencies
+          fetch-depth: 0
+      - name: Rebase `scala-steward-dependencies` branch to latest `origin/master`
+        run: |
+            git rebase origin/master
+            git push -f -u origin scala-steward-dependencies