workflow: Add workflow files for ci

This patch adds workflow files for ci:

[schedule_work.yml]
  - runs every 30 mins.
  - sync repo with upstream repo and rebase workflow branch to tip of
    master.
  - creates PR after reading patches from patchwork.kernel.org

[ci.yml]
  - Run the following tests:
    - checkpatch
    - gitlint
    - make
    - make check

[code_scan.yml]
  - Static code checks
  - Runs Coverity, Clang code scan, and Cppcheck

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on: [pull_request]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    name: CI for Pull Request
+    steps:
+    - name: Checkout the source code
+      uses: actions/checkout@v2
+      with:
+        path: src
+
+    - name: CI
+      uses: tedd-an/action-ci@dev
+      with:
+        src_path: src
+        github_token: ${{ secrets.ACTION_TOKEN }}
+        email_token: ${{ secrets.EMAIL_TOKEN }}
+        patchwork_token : ${{ secrets.PATCHWORK_TOKEN }}

.github/workflows/code_scan.yml

@@ -0,0 +1,26 @@
+name: Code Scan
+
+on:
+  schedule:
+  - cron:  "10 7 * * FRI"
+
+jobs:
+  code-scan:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout the source
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+        path: src
+    - name: Code Scan
+      uses: tedd-an/action-code-scan@dev
+      with:
+        src_path: src
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        email_token: ${{ secrets.EMAIL_TOKEN }}
+    - uses: actions/upload-artifact@v2
+      with:
+        name: scan_report
+        path: scan_report.tar.gz
+

.github/workflows/schedule_work.yml

@@ -0,0 +1,37 @@
+name: Scheduled Work
+
+on:
+  schedule:
+  - cron:  "15,45 * * * *"
+
+jobs:
+
+  manage_repo:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Manage Repo
+      uses: tedd-an/action-manage-repo@master
+      with:
+        src_repo: "bluez/bluez"
+        src_branch: "master"
+        dest_branch: "master"
+        workflow_branch: "workflow"
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+
+  create_pr:
+    needs: manage_repo
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Patchwork to PR
+      uses: tedd-an/action-patchwork-to-pr@master
+      with:
+        base_branch: "workflow"
+        github_token: ${{ secrets.ACTION_TOKEN }}