packaging: add version check in release package tests

[patrick-stephens]

Signed-off-by: Patrick Stephens [email protected]

Minor improvement to release process to verify the version we're expecting is installed.

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Enter [N/A] in the box, if an item is not applicable to your change.

Testing

Checking for latest works:

$ VERSION_TO_CHECK_FOR=2.0.5 ./test-release-packages.sh 
...
Installation completed. Happy Logging!

Fluent Bit v2.0.5
Git commit: 
+ check_version /tmp/tmp.WAOUgMtLHG
+ [[ -n 2.0.5 ]]
+ local LOG_FILE=/tmp/tmp.WAOUgMtLHG
+ grep -q 2.0.5 /tmp/tmp.WAOUgMtLHG
+ rm -f /tmp/tmp.WAOUgMtLHG
...
$ echo $?
0

Failure case works:

$ VERSION_TO_CHECK_FOR=2.0.4 ./test-release-packages.sh
...
Installation completed. Happy Logging!

Fluent Bit v2.0.5
Git commit: 
+ check_version /tmp/tmp.RwYk6CfwuJ
+ [[ -n 2.0.4 ]]
+ local LOG_FILE=/tmp/tmp.RwYk6CfwuJ
+ grep -q 2.0.4 /tmp/tmp.RwYk6CfwuJ
+ echo 'WARNING: Not using expected version: 2.0.4'
WARNING: Not using expected version: 2.0.4
+ exit 1
$ echo $?
1

No version also passes:

$ ./test-release-packages.sh 
...
$ echo $?
0

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.