ci: limit permissions of GITHUB_TOKEN and add actionlint #528

Job	Run time
ensure-actions-sha-pin	2s
golden-tests	32s
lint	15s
integration-test (1.27.16, kong)	1m 49s
lint-test (1.31.4, kong)	11m 2s
integration-test (1.27.16, ingress)	1m 51s
integration-test (1.27.16, gateway-operator)	1m 38s
lint-test (1.31.4, ingress)	3m 13s
oldversion-integration-test (2.10, 3.3, kong)	1m 37s
lint-test (1.31.4, gateway-operator)	4m 6s
oldversion-integration-test (2.10, 3.3, ingress)	1m 25s
integration-test (1.28.15, kong)	2m 3s
oldversion-integration-test (2.10, 3.2, kong)	1m 32s
integration-test (1.28.15, ingress)	1m 51s
oldversion-integration-test (2.10, 3.2, ingress)	1m 38s
integration-test (1.28.15, gateway-operator)	1m 36s
oldversion-integration-test (2.11, 3.3, kong)	1m 35s
integration-test (1.29.12, kong)	1m 54s
oldversion-integration-test (2.11, 3.3, ingress)	1m 32s
integration-test (1.29.12, ingress)	1m 46s
oldversion-integration-test (2.11, 3.2, kong)	1m 29s
oldversion-integration-test (2.11, 3.2, ingress)	1m 29s
integration-test (1.29.12, gateway-operator)	1m 37s
integration-test (1.30.8, kong)	1m 50s
integration-test (1.30.8, ingress)	1m 51s
integration-test (1.30.8, gateway-operator)	1m 38s
integration-test (1.31.4, kong)	1m 46s
integration-test (1.31.4, ingress)	1m 35s
integration-test (1.31.4, gateway-operator)	1m 28s
integration-test (1.32.0, kong)	1m 42s
integration-test (1.32.0, ingress)	1m 46s
integration-test (1.32.0, gateway-operator)	1m 22s
passed	1s
	1h 2m 31s

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