Added startupProbe

[mustdiechik]

Added startupProbe

• to increase start speed up.
• best practice
• some migrations can takes a long time and initialDelaySeconds=90 for livenessProbe maybe a little.

[mattermost-build]

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[mustdiechik]

/check-cla

[stafot]

@mustdiechik In my view these values (failureThreshold,periodSeconds,initialDelaySeconds,timeoutSeconds) shouldn't be hardcoded in the template. You could follow the approach we have on this PR.

[spirosoik]

/check-cla

[spirosoik]

+1 on what @stafot mentioned

[spirosoik]

@mustdiechik looks good. Did you sign the CLA? Seems that there's still an issue

[mustdiechik]

/check-cla

[stafot]

@mustdiechik CLA looks good to me unsure why it fails. Although you need to resolve conflicts on this PR

[mustdiechik]

@stafot check please

[mustdiechik]

@spirosoik ^^

[spirosoik]

@mustdiechik let's have a similar PR for the enterprise edition too. It will be valuable there too.