Create getJar.yml

.github/workflows/getJar.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "master" branch
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v4
+
+      # Runs a single command using the runners shell
+      - name: Run a one-line script
+        run: wget -O nexus-db-migrator-3.70.1-03.jar https://download.sonatype.com/nexus/nxrm3-migrator/nexus-db-migrator-3.70.1-03.jar
+
+      - name: Compress the TAR files
+        run: tar -czf nexus-migrator.tar.gz nexus-db-migrator-3.70.1-03.jar
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: nexus-migrator-tar
+          path: nexus-migrator.tar.gz
+          retention-days: 1  # 将保留天数设置为 1 天 最多可设置90天