[Makefile] Allow local builds by using make local

[black-dragon74]

Fixes: #77

Note: You still need to export ODF_MG_TOKEN.

Example: ODF_MG_TOKEN=<MY_TOKEN_HERE> make local

This builds and tags the image as "odf-mg". You can override it using IMG_TAG environment variable.

P.S: If using rancher, just export RANCHER variable in the ENV.

Extended example: RANCHER=yes ODF_MG_TOKEN=<TOKEN_HERE> IMG_TAG=my-custom-tag make local

Regards

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: black-dragon74, yati1998

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[yati1998]

/cherry-pick release-4.13

[openshift-cherrypick-robot]

@yati1998: #76 failed to apply on top of branch "release-4.13":

Applying: Allow local builds by using `make local`
.git/rebase-apply/patch:60: new blank line at EOF.
+
warning: 1 line adds whitespace errors.
Using index info to reconstruct a base tree...
M	Makefile
Falling back to patching base and 3-way merge...
Auto-merging Makefile
CONFLICT (content): Merge conflict in Makefile
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Allow local builds by using `make local`
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-4.13

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