ci: add a v-up-works-ubuntu job, to ensure more robust v up runs (#21401)

.github/workflows/vup_works.yml

@@ -0,0 +1,71 @@
+name: Upgrading from a previous release with v up works
+
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+      - '**.yml'
+      - '**.vv'
+      - '**.out'
+      - '!**/vup_works.yml'
+      - '!cmd/tools/vup.v'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+      - '**.yml'
+      - '**.vv'
+      - '**.out'
+      - '!**/vup_works.yml'
+      - '!cmd/tools/vup.v'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref == 'refs/heads/master' && github.sha || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  v-up-works-ubuntu:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build v
+        run: make && ./v symlink -githubci && ./v version
+
+      - name: Download latest release ZIP
+        run: wget https://github.com/vlang/v/releases/latest/download/v_linux.zip
+
+      - name: Extract ZIP 1, no changes
+        run: |
+          rm -rf /tmp/v_linux && unzip -q -d v_linux/ v_linux.zip && mv v_linux /tmp/v_linux
+          cd /tmp/v_linux/v
+          ./v version
+          ./v up
+          echo "Updated ./v version: $(./v version) | Current   v version: $(v version)"
+
+      - name: Extract ZIP 2, with local changes
+        run: |
+          rm -rf /tmp/v_linux && unzip -q -d v_linux/ v_linux.zip && mv v_linux /tmp/v_linux
+          touch /tmp/v_linux/v/vlib/v/pref/local_file_not_present_in_master.c.v && rm /tmp/v_linux/v/examples/hello_world.v
+          cd /tmp/v_linux/v
+          ./v version
+          ./v up
+          echo "Updated ./v version: $(./v version) | Current   v version: $(v version)"
+
+      - name: Extract ZIP 3, with current vup.v in the extract
+        run: |
+          rm -rf /tmp/v_linux && unzip -q -d v_linux/ v_linux.zip && mv v_linux /tmp/v_linux
+          rm -rf /tmp/v_linux/v/cmd/tools/vup && cp cmd/tools/vup.v /tmp/v_linux/v/cmd/tools/vup.v
+          cd /tmp/v_linux/v
+          ./v version
+          ./v up
+          echo "Updated ./v version: $(./v version) | Current   v version: $(v version)"
+
+      - name: Extract ZIP 4, with local changes, and with current vup.v
+        run: |
+          rm -rf /tmp/v_linux && unzip -q -d v_linux/ v_linux.zip && mv v_linux /tmp/v_linux
+          rm -rf /tmp/v_linux/v/cmd/tools/vup && cp cmd/tools/vup.v /tmp/v_linux/v/cmd/tools/vup.v
+          touch /tmp/v_linux/v/vlib/v/pref/local_file_not_present_in_master.c.v && rm /tmp/v_linux/v/examples/hello_world.v
+          cd /tmp/v_linux/v
+          ./v version
+          ./v up
+          echo "Updated ./v version: $(./v version) | Current   v version: $(v version)"