Allow versions to be partially specified

[hash-d]

This is one of two options for allowing to install the latest v1 CLI via install.sh

The other is #109.

On this option, an incomplete version specification (1, 1.8, 2 or 2.0, for example) triggers the discovery of the latest release in that version line.

[pwright]

I prefer this approach as it can be used to test eg 2.0

However, to avoid problems in non bash, consider:

*)
        # 1. Safe write (standard POSIX)
        echo "${version}" > "${release_version_file}"

        # 2. Check if input is a partial version (X or X.Y)
        if expr "${version}" : '^[0-9]\+\(\.[0-9]\+\)\?$' > /dev/null; then
            log "Looking up the latest release in line ${version}"
            assert program_is_available jq

            # 3. Add per_page=100 to increase history limit
            # 4. Use 'try' in jq to prevents crashes on weird tag names
            run curl -sL \
                -H "Accept: application/vnd.github+json" \
                -H "X-GitHub-Api-Version: 2022-11-28" \
                "https://api.github.com/repos/skupperproject/skupper/releases?per_page=100" \
                | jq -r "map(select((.prerelease or .draft) | not)) 
                       | map(select(.name | startswith(\"${version}.\"))) 
                       | map(select(.name | test(\"^[0-9.]+\$\"))) 
                       | sort_by(.name | split(\".\") | map(try tonumber catch 0)) 
                       | .[-1].name // empty" \
                > "${release_version_file}"

            # 5. Proper empty check
            if [ ! -s "${release_version_file}" ] || [ "$(cat "${release_version_file}")" = "null" ]; then
                fail "No releases found in line '${version}'"
            fi
        fi
        ;;

[pwright]

given we're only supporting bash, approving