add GO variable in makefiles

[filariow]

Description

Add the GO variable to Makefile, such that it is easier to use the preferred go version.

Checks

1. Did you run make generate target? yes

2. Did make generate change anything in other projects (host-operator, member-operator)? yes
   That should not be related to this PR, but I can see the following change in host-operator:

diff --git a/config/crd/bases/toolchain.dev.openshift.com_usersignups.yaml b/config/crd/bases/toolchain.dev.openshift.com_usersignups.yaml
index 2a3320c..f656976 100644
--- a/config/crd/bases/toolchain.dev.openshift.com_usersignups.yaml
+++ b/config/crd/bases/toolchain.dev.openshift.com_usersignups.yaml
@@ -131,6 +131,8 @@ spec:
                 description: The cluster in which the user is provisioned in If not
                   set then the target cluster will be picked automatically
                 type: string
+            required:
+            - identityClaims
             type: object
           status:
             description: UserSignupStatus defines the observed state of UserSignup

3. In case of new CRD, did you the following? N/A

4. In case other projects are changed, please provides PR links. N/A

[alexeykazakov]

👍
BTW I personally use snap for quick and easy switch between different go versions when needed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud