ci: work around download-artifact bug

Work around actions/download-artifact#346.

Fixes apache#2061.

.github/workflows/native-unix.yml

@@ -130,12 +130,23 @@ jobs:
  export PATH=$RUNNER_TOOL_CACHE/go/${GO_VERSION}/${{ matrix.goarch }}/bin:$PATH
  ./ci/scripts/go_build.sh "$(pwd)" "$(pwd)/build" "$HOME/local"
 
+ # XXX: GitHub broke upload/download-artifact. To avoid symlinks being
+ # converted into weird files, tar the files ourselves first.
+ # https://github.com/apache/arrow-adbc/issues/2061
+ # https://github.com/actions/download-artifact/issues/346
+
+ - name: tar artifacts
+ shell: bash -l {0}
+ run: |
+ cd
+ tar czf ~/local.tgz local
+
  - uses: actions/upload-artifact@v4
  with:
  name: driver-manager-${{ matrix.os }}
  retention-days: 3
  path: |
- ~/local
+ ~/local.tgz
 
  # ------------------------------------------------------------
  # C/C++ (builds and tests)
@@ -355,7 +366,13 @@ jobs:
  - uses: actions/download-artifact@v4
  with:
  name: driver-manager-${{ matrix.os }}
- path: ~/local
+ path: "~"
+
+ - name: untar artifacts
+ shell: bash -l {0}
+ run: |
+ cd
+ tar xvf ~/local.tgz
 
  - name: Build GLib Driver Manager
  shell: bash -l {0}
@@ -477,7 +494,13 @@ jobs:
  - uses: actions/download-artifact@v4
  with:
  name: driver-manager-${{ matrix.os }}
- path: ~/local
+ path: "~"
+
+ - name: untar artifacts
+ shell: bash -l {0}
+ run: |
+ cd
+ tar xvf ~/local.tgz
 
  - name: Go Build
  shell: bash -l {0}
@@ -561,7 +584,13 @@ jobs:
  - uses: actions/download-artifact@v4
  with:
  name: driver-manager-${{ matrix.os }}
- path: ~/local
+ path: "~"
+
+ - name: untar artifacts
+ shell: bash -l {0}
+ run: |
+ cd
+ tar xvf ~/local.tgz
 
  - name: Build
  shell: bash -l {0}
@@ -668,10 +697,17 @@ jobs:
  if: matrix.os == 'ubuntu-latest'
  run: |
  sudo sysctl vm.mmap_rnd_bits=28
+
  - uses: actions/download-artifact@v4
  with:
  name: driver-manager-${{ matrix.os }}
- path: ~/local
+ path: "~"
+
+ - name: untar artifacts
+ shell: bash -l {0}
+ run: |
+ cd
+ tar xvf ~/local.tgz
 
  - name: Build Python
  shell: bash -l {0}