Disable imx docker CI check step because it always fails with no spac…

…e left on device (project-chip#22050)

.github/workflows/docker_img.yaml

@@ -42,7 +42,12 @@ jobs:
                     - "-esp32"
                     - "-esp32-qemu"
                     - "-infineon"
-                    - "-imx"
+                    # NOTE: imx image requires too much space for GitHub-hosted runners. It fails with:
+                    # ```
+                    # ....
+                    # ApplyLayer exit status 1 stdout:  stderr: write /opt/fsl-imx-xwayland/5.15-kirkstone/sysroots/armv8a-poky-linux/opt/ltp/testcases/bin/fanotify15: no space left on device
+                    # ```
+                    # - "-imx"
                     - "-k32w"
                     - "-mbed-os"
                     - "-nrf-platform"