Add pod labels to the SPIRE agent #1269

Job	Run time
Build matrix	5s
checks	1m 0s
lint-chart	30s
upgrade-test (v1.28.0)	6m 6s
test (v1.28.0)	16m 35s
upgrade-test (v1.27.3)	8m 38s
example-test (v1.28.0, examples/external-postgresql)	3m 23s
test (v1.27.3)	16m 52s
upgrade-test (v1.26.6)	8m 35s
example-test (v1.28.0, examples/nested)	3m 36s
test (v1.26.6)	18m 54s
example-test (v1.28.0, examples/external-mysql)	3m 40s
example-test (v1.28.0, examples/federation)	3m 28s
example-test (v1.28.0, examples/tornjak)	2m 55s
example-test (v1.28.0, examples/production)	6m 14s
example-test (v1.27.3, examples/external-postgresql)	3m 11s
example-test (v1.27.3, examples/nested)	3m 25s
example-test (v1.27.3, examples/external-mysql)	3m 54s
example-test (v1.27.3, examples/federation)	3m 43s
example-test (v1.27.3, examples/tornjak)	2m 58s
example-test (v1.27.3, examples/production)	6m 10s
example-test (v1.26.6, examples/external-postgresql)	3m 25s
example-test (v1.26.6, examples/nested)	3m 27s
example-test (v1.26.6, examples/external-mysql)	3m 23s
example-test (v1.26.6, examples/federation)	4m 0s
example-test (v1.26.6, examples/tornjak)	3m 21s
example-test (v1.26.6, examples/production)	6m 7s
	2h 27m 35s

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