Fix/unable to build docker image on windows errors

[AreebAhmad-02]

Issue #, if available:
#275 #279
Description of changes:

If we are using Windows, we may need to run the following commands to adjust line endings in the script files before building the docker image. Windows often modifies line endings in .sh files, which can cause issues. I faced this issue every time I tried to run MWAA on my local machine with docker and wsl2 installed. The commands below will convert the line endings to Unix format:

sed -i -e 's/\r$//' docker/script/bootstrap.sh
sed -i -e 's/\r$//' docker/script/systemlibs.sh
sed -i -e 's/\r$//' docker/script/generate_key.sh

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