feat(longhorn): Add backup secrets

This patch configures the longhorn backup storage for longhorn. It's a
first run until the proper backup storage is complete.

clusters/k8s01/longhorn/backup.yaml

+apiVersion: v1
+kind: Secret
+metadata:
+    name: s3-credentials
+    namespace: longhorn-system
+type: Opaque
+stringData:
+    AWS_ACCESS_KEY_ID: ENC[AES256_GCM,data:fAZhu+QwEN0=,iv:QeD3oPRZiVk0diwvXv7b94BhNIc6JtevWLrT6GEdrWk=,tag:0y29xdMgtDjFOH+zUcxpHA==,type:str]
+    AWS_SECRET_ACCESS_KEY: ENC[AES256_GCM,data:wxDXFlC3+0ONr9awanwhHCzhxAlH1HN1IC3w1ZaUQp54lSECRn4XFg==,iv:cCC+GsZ9kAVfPTQOyredcf8TQXY1GGHgaj1Fxyt+WWo=,tag:Y12YysHPyKSqL4ineA2BCQ==,type:str]
+    AWS_ENDPOINTS: ENC[AES256_GCM,data:zC+NoQDCtOMZwNQLoKMGZ13lQXVMc7f8j0s2+sBZzuM=,iv:l2Js0karYfC3x+5P/tY2c+EEZhbNrXw0SemuC+eJDjs=,tag:NAGJDsHy2GD4S2NZJdrsyQ==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age: []
+    lastmodified: "2022-07-10T13:04:00Z"
+    mac: ENC[AES256_GCM,data:g8vATrZ7mUPMmishey/FkWk/cXSVflt8k61yFRTyu7Wh4vwK5sNdG4Vzdzp+YkVefCiOooKql7isOPHT2PrtdutEMeAD14gHHCq333l7oE3AxpAuUM22e+U+EI91DEwOllBa98abcPXCiscbQfqSanSA4McLftFeJGgrNBeOtFE=,iv:LqxCoUf9bXVzyca034b2CjsZ5FtFI6A4w0ryUYZS+oQ=,tag:8joB8jMeeSEE+THh3gKvcA==,type:str]
+    pgp:
+        - created_at: "2022-07-10T13:03:59Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
+
+            wcFMA7kpg2bgzVHcARAAD/hpgG0aE0BAbucuhDvnU6y4AHA5qNDzuA6UrzpMmZvd
+            /zQ/hRluGhHN5//n8usQkXmSN72il+FYFtsQFrLtkzzEEYGqsJcimJ28cj0Oz9uc
+            +NxKN63w2eG4caO1TkUniUSoTgtYnti6jbMkqmcz7Q6/gjoaIegsXQAM3eHHjdTk
+            VT6iAdACUTmuP0uiQxdmshcEcT1JWwJl9x41mGgcH41Npxaq0ajWf4hIzACaYqf6
+            27IpagwQMjcbSCUjmIvftPXj1OdfbBDtcWcDbs+0AkvWC+5f/UiVVs839g4edCPQ
+            qeW3B7ISfiFIQhaolPuQd8H4ciT14KfTu/X+PWIsg+oxlI0wirj0Y7ENNn6oM3pL
+            Twt3xVtA5TUD2QWG3la0XVqBb5n2IzMkKUiQDbmhvDBoDhQIzaYNK3RI/wghP9Q4
+            heNNmX312AtWZo4NVcIi1pbuDGMyKGeHJCzsxKYf8Mq9oB+DolllFKpiOUTQXLVX
+            URw9E+Ss1xwFb8MREMKkEhtj7FcO0AOdfT12M+WCoQtQVxh6vNi5ktpw2TNtWV6B
+            jGPcW7UOSfd64StF7AJpPqZTkin3KEkBzFj8HkpaMMC5qNwQATsOa/C2oMI7uzoU
+            zCpCOejmEflVVitJu4/Rf7R5NV70NWuTgLItb3NNASMVB1/bgB9q9QJJDW6HzYjS
+            5gFpFrC5KezI9YRYzpGtwOwhjCzzsWbvRwuVgU/He231hXWsZum+TmbVcya9554Q
+            znpBE8cO4QuYheLUTcpg9a/kbwX2z7YMcbg9KX2bNEb2PeL8axI6AA==
+            =i7fY
+            -----END PGP MESSAGE-----
+          fp: 286791FB6648539775DB31B8FCB98C2A3EC6F601
+        - created_at: "2022-07-10T13:03:59Z"
+          enc: |
+            -----BEGIN PGP MESSAGE-----
+
+            hQIMA4oYbIHZIrAPARAAue9PkHD/ptYpzV/HeBY4kETecSBwzAdD2UVdEk1laNh7
+            H+ZXoNsujC8rr/UtjNuVCn2f9Z+HzNsPIx0l25xRoXcK+ah9U86rcg7t6CTELPt2
+            6ZFxLs4oKWQ4jcZvxEoWxA4w8W1MDdp7wZsQWTtp0zBNIvv8yFBPayqxMWIs3lYX
+            3QFkzXTUIJCoyI0z0igegj3DyT1rZilhcKvp1A8tcONekSgdHKcBu0ErxmnmaaJm
+            pLlX/W5AVDAI88gIJf0xazeTkc0Vo91sLhOtT6IhC6s7eXKBd2xrgmUbNrbDjet4
+            fz0aGwHuBdAfcygkAR5JG2rvWF65JLBkwJotaU5CgkKWZdL/+I9GJzPPs/CTgmBp
+            uyCYXKjjm+GB6JZzy1IJlw90ZOIDObeSy9HltEMjg7I76kbr23qQroiyZO0XrwRM
+            tGYI5rTDoyI3HvvcxxJeLxMtQUi7cIIIGHbA1dlv8avVPsVv8lC3SNpIsL7MKLQZ
+            2ErwtPQ+7mRazzcqT9xn4SYMKvn+Xbs5KBBVPasFQzyEXOLJ3UsIZrM6/rZj2odK
+            o5AbUfMpYYdVlf9B8PlzAg/g0DIrOMbm7kTeZDNVncC573GS9pPF5fdmEcrGzc5M
+            mBsJ26Dbwq36qoFcaM9C1p4tInL/59713DvozrwdyqNc1gL+zhH/kDC7Z3HNKKPU
+            ZgEJAhBuLHZHD/6ZO5RcAeBWl5jzG+wn1unqateAO6QDyZ2+036cA3m5qbme7ydB
+            csAt4dn9wdFlUWkUd2p7jGtcY9vuQY/p0pOULNz7YjeOEwPIcbmca/h55Bm24ew4
+            GodvISY3PA==
+            =5NoA
+            -----END PGP MESSAGE-----
+          fp: B137EE1549DFAF960DD1E2B15147025FB9F09E07
+    encrypted_regex: ^(data|stringData|email|dnsZones?|dnsNames?|.*(H|h)osts?|tang|externalURL|.*-secret|.*-url|.*Secrets?|.*-domain|password|subjects|node|apiURL|.*(S|s)erverNames?|.*SecretKey)$
+    version: 3.7.1

clusters/k8s01/longhorn/kustomization.yaml

 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
+- backup.yaml
 - certificate.yaml
 - oauth2.yaml
 - ingress.yaml