Introduce an argo-healthcheck make target

[mbaldessari]

This is a simple quick check to see if all argo applications in all
namespaces are synced and error out if they are not.

Synced example:

$ make argo-healthcheck
make -f common/Makefile argo-healthcheck
make[1]: Entering directory '/home/michele/Engineering/cloud-patterns/multicloud-gitops'
Checking argo applications
multicloud-gitops-hub acm -> Synced
multicloud-gitops-hub config-demo -> Synced
multicloud-gitops-hub golang-external-secrets -> Synced
multicloud-gitops-hub hello-world -> Synced
multicloud-gitops-hub vault -> Synced
openshift-gitops multicloud-gitops-hub -> Synced
make[1]: Leaving directory '/home/michele/Engineering/cloud-patterns/multicloud-gitops'

Not synced example:

$ make argo-healthcheck
make -f common/Makefile argo-healthcheck
make[1]: Entering directory '/home/michele/Engineering/cloud-patterns/multicloud-gitops'
Checking argo applications
multicloud-gitops-hub acm -> Synced
multicloud-gitops-hub config-demo -> OutOfSync
multicloud-gitops-hub golang-external-secrets -> Synced
multicloud-gitops-hub hello-world -> Synced
multicloud-gitops-hub vault -> Synced
openshift-gitops multicloud-gitops-hub -> Synced
Applications not synced: 1
make[1]: *** [common/Makefile:115: argo-healthcheck] Error 1
make[1]: Leaving directory '/home/michele/Engineering/cloud-patterns/multicloud-gitops'
make: *** [Makefile:12: argo-healthcheck] Error 2

[day0hero]

@mbaldessari - this is a good idea ... iirc, @claudiol is working on better status in the operator too. a combination of both of these things will be good for all the ci's ...

just a thought - it'd be neato if when the application is not synced, we get a dump of the output from the application so we can see where its failing/not -syncing

[mbaldessari]

Thanks @day0hero, the stuff that might land in the operator will be async by design, this is more "is everything green now" kind of question. The way I plan to use this is in my deployments scripts to wait for a deployment to be completed with a single comment (.e.g if make argo-healthcheck returns 0 I am good to go). I'd avoid adding any more output mainly because doing it in shell wrapped in Makefile is a terrible thing to do already ;)