Avoid setting memory limit in reader if not set explicitly

Changelog for 0.15.0-rc2:

• PR #233 Avoid setting memory limit in reader if not set explicitly by @nitishkumar71
• PR #240 Bump gateway version 0.21.3 by @nitishkumar71
• PR #221 Handled list secrets for no secret in namespaces by @nitishkumar71
• PR #219 chore: improve multipass cloud-config and instructions by @LucasRoesler

Commits
8ac45f5 Avoid providing memory limit if not set explicitly by @nitishkumar71
3579061 Bump gateway version 0.21.3 by @nitishkumar71
761d184 Update ISSUE_TEMPLATE.md by @alexellis
8003748 Review feedback for Labeller by @alexellis
a2ea804 Handled list secrets for no secret in namespaces by @nitishkumar71
551e664 chore: improve multipass cloud-config and instructions by @LucasRoesler

Changes: 0.15.0-rc1...0.15.0-rc2

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