Changing shebang in `build` and `deploy` scripts for better portability

[paniash]

Changes made

Changed shebang in build.sh from #!/bin/bash to #!/usr/bin/env bash.

Justification

In build.sh, the bash interpreter path is provided as #!/bin/bash, which is good but only for specific systems (*nix). In other systems, this path might not be where bash exists and a reasonable shebang would be #!/usr/bin/env bash, which is much more portable. Please refer this to learn more.

[divshacker]

Have you tested this on other systems? @paniash

[paniash]

Explicitly no. But I see no reason why it shouldn't work. :-)

[divshacker]

@frankharkins What do you think ?

[frankharkins]

Really need @vabarbosa to look over.