ci: Retry apt-get install at most three times
ci: Retry apt-get install at most three times

Try harder instead of failing after the first invocation fails.

andrewrk/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig