For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:eeich:emacs/openSUSE_Leap_15.4/home:eeich:emacs.repo
zypper refresh
zypper install emacs-golang-mode
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:eeich:emacs/openSUSE_Leap_15.3/home:eeich:emacs.repo
zypper refresh
zypper install emacs-golang-mode
For SUSE SLE-15-SP4 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:eeich:emacs/SUSE_SLE-15-SP4_Update/home:eeich:emacs.repo
zypper refresh
zypper install emacs-golang-mode
For SUSE SLE-15-SP3 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:eeich:emacs/SUSE_SLE-15-SP3_Update/home:eeich:emacs.repo
zypper refresh
zypper install emacs-golang-mode