[CI] Make building static/shared configurable (#8272)

[CI] Make building static/shared configurable (#8272)

This commit changes our CI workflow to actually pass through
build-shared and build-static to the configure-and-build action
and fixes how the condition is checked there. If we just pass through
the inputs, then the condition "${{ inputs.build-shared }}" != "true"
would be true (i.e., the step would be skipped) if
build-shared/build-static are not set explicitly in ci.yml because
of the default values for build-shared/build-static in ci.yml.