Netdata: Installer appears to ignore `--stable-channel` flag

[petecooper]

Bug report summary

Installer appears to ignore --stable-channel flag, installs nightly instead of GitHub release.

OS / Environment

$ uname -a; grep -Hv "^#" /etc/*release
Linux darwin 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
/etc/lsb-release:DISTRIB_ID=Ubuntu
/etc/lsb-release:DISTRIB_RELEASE=20.04
/etc/lsb-release:DISTRIB_CODENAME=focal
/etc/lsb-release:DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS"
/etc/os-release:NAME="Ubuntu"
/etc/os-release:VERSION="20.04 LTS (Focal Fossa)"
/etc/os-release:ID=ubuntu
/etc/os-release:ID_LIKE=debian
/etc/os-release:PRETTY_NAME="Ubuntu 20.04 LTS"
/etc/os-release:VERSION_ID="20.04"
/etc/os-release:HOME_URL="https://www.ubuntu.com/"
/etc/os-release:SUPPORT_URL="https://help.ubuntu.com/"
/etc/os-release:BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
/etc/os-release:PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
/etc/os-release:VERSION_CODENAME=focal
/etc/os-release:UBUNTU_CODENAME=focal

Netdata version

$ /usr/sbin/netdata -V
netdata v1.21.1-78-nightly

$ $(ps aux | grep -E -o "[a-zA-Z/]+netdata ") -V
netdata v1.21.1-78-nightly

Component Name

Installer.

Steps To Reproduce

git clone --depth 1 https://github.com/netdata/netdata.git /opt/netdata/ \
&& cd /opt/netdata/ \
&& sudo bash /opt/netdata/netdata-installer.sh \
--auto-update \
--disable-cloud \
--disable-telemetry \
--dont-wait \
--enable-ebpf \
--stable-channel \
&& echo -e '==> Checking Netdata version...' \
&& /usr/sbin/netdata -v

Expected behavior

Installer should install current release version (v1.21) not nightly.

[ilyam8]

Hi @petecooper

dup of #8142