chore: update shebang in scripts

[koralowiec]

Fixes #86

[koralowiec]

Tests for *-sdkman features started to fail due to command not found error. I found out that the PATH variable is not properly set for non-interactive Bash shells.

The sourcing of an sdkman's init script is included in /etc/bash.bashrc (at the end of it):

export SDKMAN_DIR=/usr/local/sdkman
. ${SDKMAN_DIR}/bin/sdkman-init.sh

/etc/bash.bashrc is not sourced for non-interactive Bash session, so sdkman is not initialized properly.

Sourcing /etc/bash.bashrc in (test scripts) doesn't solve the problem:

source /etc/bash.bashrc

As /etc/bash.bashrc contains a check that exits the script if run non-interactively (at the top of it):

# If not running interactively, don't do anything
[ -z "$PS1" ] && return

Finally, I was able to get the correct PATH in *-sdkman tests by simply adding the sourcing of sdkman init script:

export SDKMAN_DIR=/usr/local/sdkman
source ${SDKMAN_DIR}/bin/sdkman-init.sh