Add CI (autowarefoundation#12)

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Type
+
+<!-- Select one and remove others. If an appropriate one is not listed, please write by yourself. -->
+
+- New Feature
+- Improvement
+- Bug Fix
+
+## Related Links
+
+<!-- Please write related links to GitHub/Jira/Slack/etc. -->
+
+## Description
+
+<!-- Describe what this PR changes. -->
+
+## Review Procedure
+
+<!-- Explain how to review this PR. -->
+
+## Remarks
+
+<!-- Write remarks as you like if you need them. -->
+
+## Pre-Review Checklist for the PR Author
+
+**PR Author should check the checkboxes below when creating the PR.**
+
+- [ ] Code follows [coding guidelines][coding-guidelines]
+- [ ] Assign PR to reviewer
+
+## Checklist for the PR Reviewer
+
+**Reviewers should check the checkboxes below before approval.**
+
+- [ ] Commits are properly organized and messages are according to the guideline
+- [ ] Code follows [coding guidelines][coding-guidelines]
+- [ ] (Optional) Unit tests have been written for new behavior
+- [ ] PR title describes the changes
+
+## Post-Review Checklist for the PR Author
+
+**PR Author should check the checkboxes below before merging.**
+
+- [ ] All open points are addressed and tracked via issues or tickets
+- [ ] Write [release notes][release-notes]
+
+## CI Checks
+
+- **Build and test for PR / build-and-test-pr**: Required to pass before the merge.
+- **Build and test for PR / clang-tidy-pr**: NOT required to pass before the merge. It is up to the reviewer(s).
+- **Check spelling**: NOT required to pass before the merge. It is up to the reviewer(s). See [here][spell-check-dict] if you want to add some words to the spell check dictionary.
+
+[coding-guidelines]: https://tier4.atlassian.net/wiki/spaces/AIP/pages/1194394777/T4
+[release-notes]: https://tier4.atlassian.net/wiki/spaces/AIP/pages/563774416
+[spell-check-dict]: https://github.com/tier4/autoware-spell-check-dict#how-to-contribute

.github/workflows/sync-main-for-develop.yml

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+name: sync main for develop
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 19 * * *" # run at 4 AM JST
+
+jobs:
+  sync-main-for-develop:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Generate Token
+        uses: tibdex/github-app-token@v1
+        id: generate-token
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+
+      - name: Create Pull Request
+        uses: tier4/github-actions/create-sync-main-pull-request@main
+        id: create-pull-request
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          base-branch: develop
+          main-branch: main
+          sync-branch: sync-main-for-develop
+
+      - name: Enable Auto-merge
+        if: steps.create-pull-request.outputs.pull-request-operation == 'created'
+        uses: peter-evans/enable-pull-request-automerge@v1
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          pull-request-number: ${{ steps.create-pull-request.outputs.pull-request-number }}
+          merge-method: merge