adds a label for initContainers, test and user-guide

[sosan]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add label for initContainers
for example:
kompose.init-contaners.name: "init-service"
kompose.init-contaners.image: "busybox:1.28"
kompose.init-contaners.command: "['sh', '-c', 'until nslookup myservice.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for myservice; sleep 2; done']"

Which issue(s) this PR fixes:

Feature #1772

Special notes for your reviewer:

[TessaIO]

@sosan Thanks for the PR. I put some comments below, and I'll do another round of review once my comments are addressed. One thing to add, can you add some e2e tests for this?

[sosan]

@sosan Thanks for the PR. I put some comments below, and I'll do another round of review once my comments are addressed. One thing to add, can you add some e2e tests for this?

suggestions fixed
added test e2e for initcontainer

===> Starting test <===
convert::expect_success_and_warning: Running: 'kompose -f /home/runner/work/kompose/kompose/script/test/fixtures/initcontainer/compose.yaml convert --stdout --with-kompose-annotation=false' expected_output: '/home/runner/work/kompose/kompose/script/test/fixtures/initcontainer/output-k8s.yaml' expected_warning: ''
PASS: converted output matches
PASS: warning found: ''

[cdrage]

Sorry for the delay!

Some feedback:

• contaners is spelt wrong
• To match all the other labels, it should be kompose.init.container.name and kompose.init.container.image and kompose.init.container.command.

Good addition! Again, apologizes for the delay.

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[sosan]

Sorry for the delay!

Some feedback:

• contaners is spelt wrong
• To match all the other labels, it should be kompose.init.container.name and kompose.init.container.image and kompose.init.container.command.

Good addition! Again, apologizes for the delay.

changed labels to kompose.init.container.name, kompose.init.container.image, kompose.init.container.command
fixed documentation, tests and e2e
also merged main with new commits to this branch

[cdrage]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cdrage, sosan

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e2e tests have been added now