Add rocky linux support to GetOSVersion

Author: sudheernv

Diff for: pkg/util/helpers_linux.go

@@ -56,6 +56,8 @@ func getOSVersion(osReleasePath string) (string, error) {
 		return getDebianVersion(osReleaseMap), nil
 	case "centos":
 		return getDebianVersion(osReleaseMap), nil
+	case "rocky":
+		return getDebianVersion(osReleaseMap), nil
 	case "rhel":
 		return getDebianVersion(osReleaseMap), nil
 	case "ol":

Diff for: pkg/util/helpers_linux_test.go

@@ -51,6 +51,12 @@ func TestGetOSVersionLinux(t *testing.T) {
 			expectedOSVersion: "centos 7 (Core)",
 			expectErr:         false,
 		},
+		{
+			name:              "rocky",
+			fakeOSReleasePath: "testdata/os-release-rocky",
+			expectedOSVersion: "rocky 8.5 (Green Obsidian)",
+			expectErr:         false,
+		},
 		{
 			name:              "rhel",
 			fakeOSReleasePath: "testdata/os-release-rhel",

Diff for: pkg/util/testdata/os-release-rocky

@@ -0,0 +1,13 @@
+NAME="Rocky Linux"
+VERSION="8.5 (Green Obsidian)"
+ID="rocky"
+ID_LIKE="rhel centos fedora"
+VERSION_ID="8.5"
+PLATFORM_ID="platform:el8"
+PRETTY_NAME="Rocky Linux 8.5 (Green Obsidian)"
+ANSI_COLOR="0;32"
+CPE_NAME="cpe:/o:rocky:rocky:8.5:GA"
+HOME_URL="https://rockylinux.org/"
+BUG_REPORT_URL="https://bugs.rockylinux.org/"
+ROCKY_SUPPORT_PRODUCT="Rocky Linux"
+ROCKY_SUPPORT_PRODUCT_VERSION="8"