Update CI.md document

Signed-off-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

docs/developers/ci.md

@@ -13,6 +13,7 @@ debian11 |  :white_check_mark: | :x: | :white_check_mark: | :x: | :x: | :x: | :w
 debian12 |  :white_check_mark: | :white_check_mark: | :white_check_mark: | :x: | :x: | :x: | :x: |
 fedora39 |  :white_check_mark: | :x: | :x: | :x: | :x: | :white_check_mark: | :x: |
 fedora40 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
+flatcar4081 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
 openeuler24 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
 opensuse15 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
 rockylinux8 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
@@ -32,6 +33,7 @@ debian11 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 debian12 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 fedora39 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
 fedora40 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
+flatcar4081 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 openeuler24 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 opensuse15 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 rockylinux8 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
@@ -51,6 +53,7 @@ debian11 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
 debian12 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
 fedora39 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 fedora40 |  :white_check_mark: | :x: | :x: | :x: | :x: | :x: | :x: |
+flatcar4081 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 openeuler24 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |
 opensuse15 |  :x: | :white_check_mark: | :x: | :x: | :x: | :x: | :x: |
 rockylinux8 |  :x: | :x: | :x: | :x: | :x: | :x: | :x: |