[Feat] continuous-delivery via Github Actions (#3)

Initial commit for workflow yml file of Github Actions.
Tests should be performed before merged into master.

.github/workflows/manual-triggered-tag-based-release.yml

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+name: Manual Triggered Release
+
+on: workflow_dispatch
+
+jobs:
+  release-on-tag:
+    runs-on: ubuntu-20.04
+
+    steps:
+        - name: Checkout - Fetch all History & tags
+          id: checkout
+          uses: actions/checkout@v2
+          with:
+            ref: master
+            clean: true
+            fetch-depth: 0
+
+        - name: Check if workflow should run
+          id: tagcheck
+          run: |
+            headtag=$(git log -n 1 --decorate --pretty=oneline | sed -n -e 's/^.*tag\:\s\(v\S*\),.*$/\1/p' | xargs)
+            if [ -z $headtag ] ; then exit 1 ; fi 
+            echo "::set-output name=tagname::$(echo $headtag)"
+        
+        - name: Prepare commit for release branch
+          id: mkcommit
+          if: steps.tagcheck.conclusion == 'success'
+          run: |
+            mkdir -p /tmp/cloudflare-ddns-edgeos/
+            while IFS= read -r filename ; do if [ -f ./"$filename" ]; then cp "$filename" /tmp/cloudflare-ddns-edgeos/ ; fi ; done < ./dev-misc/release-file-include
+            tar -cvz --exclude-vcs -f /tmp/cloudflare-ddns-edgeos.tar.gz /tmp/cloudflare-ddns-edgeos/
+            mkdir ./release_dir && mv /tmp/cloudflare-ddns-edgeos.tar.gz ./release_dir
+        
+        - name: Commit & Push to release branch
+          id: publish
+          if: steps.tagcheck.conclusion == 'success'
+          uses: s0/git-publish-subdir-action@develop
+          env:
+            REPO: self
+            BRANCH: release
+            FOLDER: release_dir
+            SQUASH_HISTORY: false
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+            MESSAGE: $${ steps.tagcheck.outputs.tagname }
+
+
+

dev-misc/release-file-include

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+cfddns.sh
+cloudflare-ddns
+README.md
+LICENSE