Env

[Schmaetz]

This PR adds the ability to define labels and ENVs globally for the entire cluster, as well as for individual components.

ENVs can be created for each container:
spec.env for all containers
spec.postgresql.env for the PostgreSQL containers
...
(Exporter sidecar, pgbackrest and connection pooler)

Labels can be created globally or for pods
spec.labels applies to all pods in the cluster
spec.postgresql.labels applies to the pg pods
...
(pgbackrest and ConnectionPooler)
Updates to the documentation and the Helm chart are also included

[coveralls]

Pull Request Test Coverage Report for Build 23616179127

Details

• 79 of 304 (25.99%) changed or added relevant lines in 7 files are covered.
• 5 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.2%) to 30.014%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cluster/resources.go	21	24	87.5%
pkg/cluster/util.go	17	34	50.0%
pkg/cluster/cluster.go	1	38	2.63%
pkg/cluster/connection_pooler.go	32	75	42.67%
pkg/cluster/k8sres.go	7	61	11.48%
pkg/cluster/sync.go	0	71	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/cluster/connection_pooler.go	1	80.47%
pkg/cluster/k8sres.go	1	55.68%
pkg/cluster/sync.go	3	21.74%

Totals
Change from base Build 21332921976:	-0.2%
Covered Lines:	5233
Relevant Lines:	17435

---

💛 - Coveralls