Merge bitcoin/bitcoin#22912: ci: Fix merge_script in MSVC task

f78cc90524dc15c8981da2a480621c2e47e3c7dd ci: Fix merge_script in MSVC task (Hennadii Stepanov)

Pull request description:

  The new `merge_script` in the MSVC build task does not really exit early when the task is triggered by a non-pr.

  In the current code https://github.com/bitcoin/bitcoin/blob/e4aa9b15b9f80a08076ad329b473fe9107d9e65e/.cirrus.yml#L104

  the `exit 0` command exits from the PowerShell call, not the recent `merge_script`. This cause the next lines https://github.com/bitcoin/bitcoin/blob/e4aa9b15b9f80a08076ad329b473fe9107d9e65e/.cirrus.yml#L105-L107 are executed unconditionally.

  Here is an excerpt from [CI task log](https://api.cirrus-ci.com/v1/task/4578647416766464/logs/merge.log) for the ["Merge #22915: Remove confusing CAddrDB " commit](https://github.com/bitcoin/bitcoin/commit/896649996bdaa80300fa20027a9789558233268d):
  ```
  ...
  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>call powershell.exe -NoLogo -EncodedCommand ZwBpAHQAIAByAGUAcwBlAHQAIAAtAC0AaABhAHIAZAA=
  HEAD is now at 896649996 Merge bitcoin/bitcoin#22915: Remove confusing CAddrDB

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>if 0 NEQ 0 exit /b 0

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>call powershell.exe -NoLogo -EncodedCommand aQBmACAAKAAkAGUAbgB2ADoAQwBJAFIAUgBVAFMAXwBQAFIAIAAtAGUAcQAgACQAbgB1AGwAbAApACAAewAgAGUAeABpAHQAIAAwADsAIAB9AA==

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>if 0 NEQ 0 exit /b 0

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>call powershell.exe -NoLogo -EncodedCommand ZwBpAHQAIABmAGUAdABjAGgAIAAkAGUAbgB2ADoAQwBJAFIAUgBVAFMAXwBSAEUAUABPAF8AQwBMAE8ATgBFAF8AVQBSAEwAIAAkAGUAbgB2ADoAQwBJAFIAUgBVAFMAXwBCAEEAUwBFAF8AQgBSAEEATgBDAEgA
  From https://github.com/bitcoin/bitcoin
   * branch                HEAD       -> FETCH_HEAD

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>if 0 NEQ 0 exit /b 0

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>call powershell.exe -NoLogo -EncodedCommand ZwBpAHQAIABtAGUAcgBnAGUAIABGAEUAVABDAEgAXwBIAEUAQQBEAA==
  Already up to date.

  C:\Users\ContainerAdministrator\AppData\Local\Temp\cirrus-ci-build>if 0 NEQ 0 exit /b 0
  ```

  This PR fixes this issue, and makes `merge_script` log more readable.

ACKs for top commit:
  MarcoFalke:
    Concept ACK f78cc90524dc15c8981da2a480621c2e47e3c7dd

Tree-SHA512: c88b115f99f9019a4100a10df051e32c05487612c13105d10873b9cf38965eeca731604d36610ae750cb1f93ba77ce97dca7599fe4984181210d0753be4eb9a0

0 files changed, 0 insertions, 0 deletions