[ci] fix linux builds (#10175)

.github/workflows/main.yml

@@ -702,7 +702,7 @@ jobs:
           # mkdir ./linuxBinaries
           # curl -sSL https://build.haxe.org/builds/haxe/linux64/haxe_latest.tar.gz -o ./linuxBinaries/haxe_bin.tar.gz
       
-          sudo apt install -qqy libmbedtls-dev
+          sudo apt install -qqy libmbedtls-dev libgtk2.0-0
       
           set -ex
           tar -xf linuxBinaries/*_bin.tar.gz -C linuxBinaries --strip-components=1

extra/github-actions/test-linux.yml

@@ -3,7 +3,7 @@
     # mkdir ./linuxBinaries
     # curl -sSL https://build.haxe.org/builds/haxe/linux64/haxe_latest.tar.gz -o ./linuxBinaries/haxe_bin.tar.gz
 
-    sudo apt install -qqy libmbedtls-dev
+    sudo apt install -qqy libmbedtls-dev libgtk2.0-0
 
     set -ex
     tar -xf linuxBinaries/*_bin.tar.gz -C linuxBinaries --strip-components=1