test: workaround the failed error

Add workaround to fix error
```
content: error: Installing to filesystem: Gathering source info from container env: Subprocess failed: ExitStatus(unix_wait_status(256))
content: error: readdir: Too many open files
```

Signed-off-by: Huijing Hei <hhei@redhat.com>

Author: HuijingHei

.github/workflows/ci.yml

@@ -196,7 +196,9 @@ jobs:
           test ${{ matrix.test_os }} = "${used_vid}"
 
       - name: Unit and container integration tests
-        run: just test-container
+        run: |
+          just test-container
+          just clean-local-images
 
       - name: Run TMT integration tests
         run: |
@@ -209,6 +211,7 @@ jobs:
         run: |
           # Only test fedora-43 on fedora-coreos:testing-devel
           if [ "${{ matrix.test_os }}" = "fedora-43" ] && [ "${{ matrix.variant }}" = "ostree" ]; then
+            podman image prune -f
             just test-tmt-on-coreos plan-bootc-install-on-coreos
           else
             echo "skipped"

Justfile

@@ -185,6 +185,7 @@ test-container: build-units build-integration-test-image
 clean-local-images:
     podman images --filter "label={{testimage_label}}"
     podman images --filter "label={{testimage_label}}" --format "{{{{.ID}}" | xargs -r podman rmi -f
+    podman image prune -f
     podman rmi {{fedora-coreos}} -f
 
 # Print the container image reference for a given short $ID-VERSION_ID for NAME

crates/xtask/src/tmt.rs

@@ -442,6 +442,11 @@ pub(crate) fn run_tmt(sh: &Shell, args: &RunTmtArgs) -> Result<()> {
             continue;
         }
 
+        // Remove coreos container image after launch
+        cmd!(sh, "podman rmi {image} -f")
+            .run()
+            .with_context(|| format!("Clean image {image} after launch"))?;
+
         // Ensure VM cleanup happens even on error (unless --preserve-vm is set)
         let cleanup_vm = || {
             if preserve_vm {

tmt/tests/examples/test-on-ostree/test-install-on-ostree.sh

@@ -31,14 +31,16 @@ if [ "$TMT_REBOOT_COUNT" -eq 0 ]; then
     stateroot=$(bootc status --json | jq -r .status.booted.ostree.stateroot)
 
     # Need bind mount for /run/host-container-storage
-    podman run --rm --privileged \
+    podman run \
+        --rm --privileged \
         -v /dev:/dev \
+        -v /var/lib/containers:/var/lib/containers \
         -v /run/host-container-storage:/run/host-container-storage:ro \
         -v /:/target \
         --pid=host \
         --security-opt label=type:unconfined_t \
         ${BOOTC_target} \
-            env BOOTC_BOOTLOADER_DEBUG=1 STORAGE_OPTS=additionalimagestore=/run/host-container-storage \
+            env STORAGE_OPTS=additionalimagestore=/run/host-container-storage \
             bootc install to-existing-root \
             --stateroot=${stateroot} \
             --skip-fetch-check \