feat(dagger/main.go): add --plaintext flag to execCmd for improved co…

…mmand execution

The addition of the `--plaintext` flag enhances the command execution by
ensuring that the output is not formatted, which can be useful for
debugging or when the command is expected to handle plain text input.

pulumi-ops/dagger/main.go

@@ -319,6 +319,7 @@ func (pmo *PulumiOps) DeployFrontendThroughGithub(
 			for idx := range strings.Split(pload.Application, ":") {
 				execCmd = append(
 					execCmd,
+					"--plaintext",
 					fmt.Sprintf("'properties.apps[%d].tag'", idx),
 					pload.DockerImageTag,
 				)