Add GitHub Actions workflow for upstream sync

.github/workflows/sync.yml

@@ -0,0 +1,34 @@
+name: Upstream Sync
+
+permissions:
+    contents: write
+
+on:
+    schedule:
+        - cron: "0 0 * * *"
+    workflow_dispatch:
+
+jobs:
+    sync_with_upstream:
+        name: Sync with Upstream
+        runs-on: ubuntu-latest
+        if: ${{ github.event.repository.fork }}
+
+        steps:
+            - name: Checkout target repo
+              uses: actions/checkout@v3
+
+            - name: Sync Upstream
+              uses: aormsby/Fork-Sync-With-Upstream-action@v3.4
+              with:
+                  target_repo_token: ${{ secrets.GITHUB_TOKEN }}
+                  upstream_sync_repo: HackJava/HackJava
+                  upstream_sync_branch: main
+                  target_sync_branch: main
+                  test_mode: false
+
+            - name: Check for Failure
+              if: failure()
+              run: |
+                  echo "[Error] Due to a change in the workflow file of the upstream repository, GitHub has automatically suspended the scheduled automatic update. You need to manually sync your fork."
+                  exit 1

custom/custom-groups.yaml

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+proxy-groups:
+  - name: PROXY
+    type: select
+    proxies:
+    - link1
+    - link2
+    - link3
+    - SOS.CMLiussss
+    - s.soo.cloudns.org
+    - gist-chinabox
+    - solace.3eye3.eu.org
+    - FreeNodes
+    - 2b3.soo.cloudns.nz

custom/custom-providers.yaml

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+proxy-providers:
+  SOS.CMLiussss:
+    <<: *providers
+    url: "https://SOS.CMLiussss.net/auto"
+
+  s.soo.cloudns.org:
+    <<: *providers
+    url: "https://s.soo.cloudns.org/sub/a55cf6c1-df22-4530-b9be-aeb837ac33ea"
+
+  gist-chinabox:
+    <<: *providers
+    url: "https://gist.githubusercontent.com/jinlon-08/06b5015c01c4190def8a171ed61abfd4/raw/mihomo.yaml"
+
+  solace.3eye3.eu.org:
+    <<: *providers
+    url: "https://solace.3eye3.eu.org/sub?token=850bc1b97675b9b0bfd4d4489aaf25ef"
+
+  FreeNodes:
+    <<: *providers
+    url: "https://gist.githubusercontent.com/shuaidaoya/9e5cf2749c0ce79932dd9229d9b4162b/raw/base64.txt"
+
+  2b3.soo.cloudns.nz:
+    <<: *providers
+    url: "https://2b3.soo.cloudns.nz/sub/66a0719f-c252-42e6-b89f-77c707b7449a"