tools/ci.sh: Use mainline zephyr.

Ayush1325 · Ayush1325 · commit ed48d3f25ca7 · 2024-10-03T18:57:44.000+05:30
- Not using latest container images or sdk since they generally work
  fine across zephyr versions. And is better for caching.

Signed-off-by: Ayush Singh &lt;ayush@beagleboard.org&gt;
diff --git a/tools/ci.sh b/tools/ci.sh
@@ -729,7 +729,7 @@ function ci_windows_build {
 
 ZEPHYR_DOCKER_VERSION=v0.26.13
 ZEPHYR_SDK_VERSION=0.16.8
-ZEPHYR_VERSION=v3.7.0
+ZEPHYR_VERSION=main
 
 function ci_zephyr_setup {
     docker pull zephyrprojectrtos/ci:${ZEPHYR_DOCKER_VERSION}
