Gather environment on e2e workflow errors

If any build step fails, try to gather the environment and upload the
gathered data as build artifacts.

The gathered data will be kept for 15 days (instead of the default 90
days) to minimize storage usage.

We manually tar the gathered data for 2 reasons:
- Avoid github limitations with special characters (:) in file names
- Get much better compression compared to zip (6m instead of 12m)

GitHub supports only zip format when downloading artifacts. You will
download a tar.gz file wrapped in a zip archive. On macOS this is
extracted automatically in one step. On Linux you will have to extract
twice and delete the .zip and .tar.gz files.

[1] actions/upload-artifact#546

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

.github/workflows/e2e.yaml

@@ -13,6 +13,7 @@ env:
   NAME_PREFIX: "rdr-"
   # Limit number of drenv workers.
   MAX_WORKERS: 4
+  GATHER_DIR: gather.${{ github.run_id }}-${{ github.run_attempt }}
 
 jobs:
   e2e-rdr:
@@ -68,6 +69,29 @@ jobs:
         cat ~/.config/drenv/${{ env.NAME_PREFIX }}rdr/config.yaml >> e2e/config.yaml
         make e2e-rdr
 
+    - name: Gather environment data
+      if: failure()
+      working-directory: test
+      run: drenv gather --directory ${{ env.GATHER_DIR }} --name-prefix ${{ env.NAME_PREFIX }} envs/regional-dr.yaml
+
+    # Tar manually to work around github limitations with special chracters (:)
+    # in file names, and getting much smaller archives comapred with zip (6m vs
+    # 12m).
+    # https://github.com/actions/upload-artifact/issues/546
+    - name: Archive gathered data
+      if: failure()
+      working-directory: test
+      run: tar czf ${{ env.GATHER_DIR }}.tar.gz ${{ env.GATHER_DIR }}
+
+    - name: Upload artifacts
+      if: failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ env.GATHER_DIR }}
+        path: test/${{ env.GATHER_DIR }}.tar.gz
+        compression-level: 0
+        retention-days: 15
+
     - name: Delete clusters
       if: always()
       working-directory: test