Drone: change default script from boost.sh to drone.sh

Author: sdarwin

ci/drone/functions.star

@@ -91,7 +91,9 @@ def linux_cxx(
   job_env.update(environment)
 
   if not buildscript:
-    buildscript = buildtype
+    # buildscript = buildtype
+    # 2026 default to drone.sh
+    buildscript = "drone"
 
   steps=[
       {
@@ -194,7 +196,9 @@ def windows_cxx(
   job_env.update(environment)
 
   if not buildscript:
-    buildscript = buildtype
+    # buildscript = buildtype
+    # 2026 default to drone.sh
+    buildscript = "drone"
   buildscript_to_run = buildscript + '.bat'
 
   return {
@@ -256,7 +260,9 @@ def osx_cxx(
   job_env.update(environment)
 
   if not buildscript:
-    buildscript = buildtype
+    # buildscript = buildtype
+    # 2026 default to drone.sh
+    buildscript = "drone"
 
   if xcode_version:
     job_env["DEVELOPER_DIR"] = "/Applications/Xcode-" + xcode_version +  ".app/Contents/Developer"
@@ -335,7 +341,9 @@ def freebsd_cxx(
   job_env.update(environment)
 
   if not buildscript:
-    buildscript = buildtype
+    # buildscript = buildtype
+    # 2026 default to drone.sh
+    buildscript = "drone"
 
   nodetmp={}
   nodetmp.update(node)