ci: Set default to fix 'unbound variable' error on main

[yurishkuro]

Which problem is this PR solving?

Build failed on main:

scripts/build-all-in-one-image.sh: line 5: $1: unbound variable

Description of the changes

• Use default value for $1 var

How was this change tested?

$ bash scripts/build-all-in-one-image.sh
+ arg1=not-pr
+ [[ not-pr == \p\r\-\o\n\l\y ]]
+ is_pull_request=false
+ BINARY=all-in-one
++ go env GOARCH
+ GOARCH=arm64
+ repo=jaegertracing/all-in-one
++ cat jaeger-ui/.nvmrc
+ expected_version=v18
++ node --version
scripts/build-all-in-one-image.sh: line 23: node: command not found
+ version=

fails much later (as expected)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

see 1 file with indirect coverage changes

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