[Packaging] linux-packaging helper.rb::detect_version function tries to find version from non-existent java/pom.xml when no ARROW_VERSION is defined

[raulcd]

Describe the bug, including details regarding any error messages, version, and platform.

I am trying to reproduce how to build linux packages locally and was testing the different steps when I realised we are still trying to identify the version from the java pom.xml if no ARROW_VERSION is used.

This is how I reproduced from arrow/dev/tasks/linux-packages/apache-arrow:

$ rake version:update ARROW_RELEASE_TIME="$(date --iso-8601=seconds)"
rake aborted!
Errno::ENOENT: No such file or directory @ rb_sysopen - /home/raulcd/code/arrow/dev/tasks/linux-packages/../../../java/pom.xml
/home/raulcd/code/arrow/dev/tasks/linux-packages/helper.rb:53:in `read'
/home/raulcd/code/arrow/dev/tasks/linux-packages/helper.rb:53:in `detect_version'
/home/raulcd/code/arrow/dev/tasks/linux-packages/apache-arrow/Rakefile:29:in `initialize'
/home/raulcd/code/arrow/dev/tasks/linux-packages/apache-arrow/Rakefile:128:in `new'
/home/raulcd/code/arrow/dev/tasks/linux-packages/apache-arrow/Rakefile:128:in `<top (required)>'
(See full trace by running task with --trace)

We should update the following to not use java/pom.xml:

arrow/dev/tasks/linux-packages/helper.rb

Lines 48 to 57 in f4a63d4

	def detect_version(release_time)
	version_env = ENV["ARROW_VERSION"]
	return version_env if version_env
	pom_xml_path = File.join(arrow_source_dir, "java", "pom.xml")
	pom_xml_content = File.read(pom_xml_path)
	version = pom_xml_content[/^ <version>(.+?)<\/version>/, 1]
	formatted_release_time = release_time.strftime("%Y%m%d")
	version.gsub(/-SNAPSHOT\z/) {"-dev#{formatted_release_time}"}
	end

Component(s)

Packaging

[kou]

Oh, sorry. I missed this.