fix: unset GITHUB_TOKEN if empty for ubi + plugins

[jdx]

                   Fixes #3070

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.01%	:white_check_mark: 66.67%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (ede21fbb1d90b91d051b3c6aa5c4b675ce570a4b) | 21496 | 16920 | 78.71% | | | Head commit (05bb99cfaf63a4912f9e982f1ea7f26dec6e6c83) | 21506 (+10) | 16926 (+6) | 78.70% (**-0.01%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3114) | 12 | 8 | **66.67%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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Hyperfine Performance

mise x -- echo

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-main x -- echo	15.3 ± 0.6	14.3	20.0	1.03 ± 0.05
mise-2024.11.20 x -- echo	14.8 ± 0.4	14.1	17.8	1.00
mise x -- echo	15.1 ± 0.4	14.3	16.6	1.02 ± 0.04

mise env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-main env	12.1 ± 0.6	11.3	21.3	1.03 ± 0.10
mise-2024.11.20 env	11.8 ± 0.9	11.0	31.0	1.00
mise env	12.0 ± 0.3	11.3	13.4	1.02 ± 0.08

mise hook-env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-main hook-env	11.9 ± 0.3	11.3	13.1	1.02 ± 0.04
mise-2024.11.20 hook-env	11.7 ± 0.4	10.9	13.0	1.00
mise hook-env	12.0 ± 0.5	11.2	13.7	1.03 ± 0.05

mise ls

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-main ls	12.4 ± 0.4	11.5	14.6	1.04 ± 0.04
mise-2024.11.20 ls	11.9 ± 0.3	11.3	13.0	1.00
mise ls	12.2 ± 0.2	11.7	13.2	1.03 ± 0.03