Always Exit with non-zero error code in error cases of install script

[Ngalstyan4]

Without this, an installation from binary file returns zero, indicating success.
This led us believe that ARM binaries were distributed in releases when building lantern-suite in ci/cd here:
https://github.com/lanterndata/lantern-suite/actions/runs/7631627710/job/20790001102#step:6:3777

[github-actions]

Benchmarks

metric	old	new	pct change
recall (after create)	0.992	0.992	-
recall (after insert)	0.992	0.992	-
select tps	5641.351	5352.125	-5.13%
select bulk(100) tps	50.989	50.919	-0.14%
select latency (ms)	4.532 ± 2.503𝜎	4.668 ± 2.853𝜎	+3.00%
select bulk(100) latency (ms)	622.385 ± 17.634𝜎	619.085 ± 28.435𝜎	-0.53%
create latency (ms)	1296.668	1249.267	-3.66%
insert tps	1585.625	1571.654	-0.88%
insert bulk(100) tps	20.727	21.293	+2.73%
insert latency (ms)	19.610 ± 7.912𝜎	19.704 ± 7.651𝜎	+0.48%
insert bulk(100) latency (ms)	1128.861 ± 362.294𝜎	1128.656 ± 304.916𝜎	-0.02%
disk usage (bytes)	6348800.000	6348800.000	-

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (23690ec) 77.68% compared to head (c50fa78) 77.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   77.68%   77.68%           
=======================================
  Files          23       23           
  Lines        1963     1963           
  Branches      492      492           
=======================================
  Hits         1525     1525           
  Misses        226      226           
  Partials      212      212