cmd/makemac: add darwin-arm64-26 bots

We have 30 arm64 instances total, so reduce the instance counts of
existing versions.

For golang/go#76798.

Change-Id: I6a6a636c157a62d7ab5b032e99a0e663e63d21ed
Reviewed-on: https://go-review.googlesource.com/c/build/+/751200
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

cmd/makemac/config.go

diff --git a/cmd/makemac/config.go b/cmd/makemac/config.go
index 728fef9..60ea1ad 100644
--- a/cmd/makemac/config.go
+++ b/cmd/makemac/config.go
@@ -83,14 +83,21 @@
 			Cert:     "secret:symbolic-datum-552/darwin-arm64-14-cert",
 			Key:      "secret:symbolic-datum-552/darwin-arm64-14-key",
 			Image:    "edbf519386cb968127d9e682ac5bbc9ca9fbc9b8e8657bade9488089bb842405",
-			Count:    10,
+			Count:    7,
 		},
 		{
 			Hostname: "darwin-arm64-15",
 			Cert:     "secret:symbolic-datum-552/darwin-arm64-15-cert",
 			Key:      "secret:symbolic-datum-552/darwin-arm64-15-key",
 			Image:    "203520220bdfe6b42592d2ae731c9cb985768c701c569ff1bc572d1573e63ad6",
-			Count:    10,
+			Count:    7,
+		},
+		{
+			Hostname: "darwin-arm64-26",
+			Cert:     "secret:symbolic-datum-552/darwin-arm64-26-cert",
+			Key:      "secret:symbolic-datum-552/darwin-arm64-26-key",
+			Image:    "b39d12df6bb6702c4ea1ae1d061b9964eb5912b514f073ece0fc5fd0bedec0cb",
+			Count:    7,
 		},
 	},
 	internalSwarming: {
@@ -122,14 +129,21 @@
 			Cert:     "secret:symbolic-datum-552/darwin-arm64-14-security-cert",
 			Key:      "secret:symbolic-datum-552/darwin-arm64-14-security-key",
 			Image:    "edbf519386cb968127d9e682ac5bbc9ca9fbc9b8e8657bade9488089bb842405",
-			Count:    5,
+			Count:    3,
 		},
 		{
 			Hostname: "darwin-arm64-15-security",
 			Cert:     "secret:symbolic-datum-552/darwin-arm64-15-security-cert",
 			Key:      "secret:symbolic-datum-552/darwin-arm64-15-security-key",
 			Image:    "203520220bdfe6b42592d2ae731c9cb985768c701c569ff1bc572d1573e63ad6",
-			Count:    5,
+			Count:    3,
+		},
+		{
+			Hostname: "darwin-arm64-26-security",
+			Cert:     "secret:symbolic-datum-552/darwin-arm64-26-security-cert",
+			Key:      "secret:symbolic-datum-552/darwin-arm64-26-security-key",
+			Image:    "b39d12df6bb6702c4ea1ae1d061b9964eb5912b514f073ece0fc5fd0bedec0cb",
+			Count:    3,
 		},
 	},
 }