fix(dockerfile): Pin docker dind images to version 28, as version 29 has breaking changes in the API that are currently causing problems with the act fork of Gitea (#769)

The effect probably does not **yet** occur in the published versions because the last publication took place before the release of Docker v29.

Therefore, no one should expect version 29 of Docker to be used, so there are basically no side effects.

---

fix #768

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/769
Reviewed-by: techknowlogick <[email protected]>
Co-authored-by: Max P. <[email protected]>
Co-committed-by: Max P. <[email protected]>

Dockerfile

@@ -17,7 +17,7 @@ RUN make clean && make build
 ### DIND VARIANT
 #
 #
-FROM docker:dind AS dind
+FROM docker:28-dind AS dind
 
 RUN apk add --no-cache s6 bash git tzdata
 
@@ -32,7 +32,7 @@ ENTRYPOINT ["s6-svscan","/etc/s6"]
 ### DIND-ROOTLESS VARIANT
 #
 #
-FROM docker:dind-rootless AS dind-rootless
+FROM docker:28-dind-rootless AS dind-rootless
 
 USER root
 RUN apk add --no-cache s6 bash git tzdata