Check update according to upstream latest tag

.github/workflows/build.yml

@@ -17,38 +17,49 @@ jobs:
         with:
           go-version: ^1.15
 
-      - name: Set variables
+      - name: Compare latest tags and set variables
         run: |
-          echo "RELEASE_NAME=$(date +%Y%m%d%H%M%S)" >> $GITHUB_ENV
-          echo "TAG_NAME=$(date +%Y%m%d%H%M%S)" >> $GITHUB_ENV
+          upstreamLatestTag=$(curl -sSL --connect-timeout 5 -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/v2fly/domain-list-community/releases/latest | grep "tag_name" | cut -d\" -f4)
+          thisLatestTag=$(curl -sSL --connect-timeout 5 -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/${{ github.repository }}/releases/latest | grep "tag_name" | cut -d\" -f4)
+          if [[ $upstreamLatestTag != $thisLatestTag ]]; then
+            echo "NeedToSync=true" >> $GITHUB_ENV
+          fi
+          echo "RELEASE_NAME=$upstreamLatestTag" >> $GITHUB_ENV
+          echo "TAG_NAME=$upstreamLatestTag" >> $GITHUB_ENV
         shell: bash
 
       - name: Checkout codebase
         uses: actions/checkout@v2
+        if: ${{ env.NeedToSync }}
 
       - name: Checkout v2fly/domain-list-community
+        if: ${{ env.NeedToSync }}
         uses: actions/checkout@v2
         with:
           repository: v2fly/domain-list-community
           path: domain-list-community
 
       - name: Append attribute rules
+        if: ${{ env.NeedToSync }}
         run: |
           echo "include:geolocation-!cn@cn" >> ./domain-list-community/data/cn
           echo "include:geolocation-cn@!cn" >> ./domain-list-community/data/geolocation-\!cn
 
       - name: Get dependencies and run
+        if: ${{ env.NeedToSync }}
         run: |
           go mod download
           go run ./ --datapath=./domain-list-community/data
 
       - name: Rename to geosite.dat && generate sha256 hash
+        if: ${{ env.NeedToSync }}
         run: |
           cd publish || exit 1
           mv dlc.dat geosite.dat
           sha256sum geosite.dat > geosite.dat.sha256sum
 
       - name: Git push assets to "release" branch
+        if: ${{ env.NeedToSync }}
         run: |
           cd publish || exit 1
           git init
@@ -61,6 +72,7 @@ jobs:
           git push -f publish release
 
       - name: Create a release
+        if: ${{ env.NeedToSync }}
         id: create_release
         uses: actions/create-release@v1
         env:
@@ -72,6 +84,7 @@ jobs:
           prerelease: false
 
       - name: Upload geosite.dat
+        if: ${{ env.NeedToSync }}
         uses: actions/upload-release-asset@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -82,6 +95,7 @@ jobs:
           asset_content_type: application/octet-stream
 
       - name: Upload geosite.dat sha256sum
+        if: ${{ env.NeedToSync }}
         uses: actions/upload-release-asset@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}