Fix COPY commands in Dockerfile

[thekaveman]

Follow up to #123.

The COPY commands I added are adding all the files directly to the /home/calitp/app directory, rather than copying the subdirectories.

I discovered this while trying to test Benefits devcontainer against the published image, getting the following error:

/bin/bash: bin/start.sh: No such file or directory

This is because start.sh is sitting directly in /home/calitp/app, not /home/calitp/app/bin.

Found out by opening bash inside the (Benefits version) of the server:

docker compose run --entrypoint bash server

Then listing the directory:

calitp@46d38f74c1b2:~/app$ ls -al
total 52
drwxr-xr-x 1 calitp root   4096 Aug 25 15:50 .
drwxr-xr-x 1 calitp calitp 4096 Aug 23 19:33 ..
-rw-r--r-- 1 root   root      0 Aug 25 15:50 __init__.py
-rw-r--r-- 1 root   root   1155 Aug 25 15:50 app.py
-rw-r--r-- 1 root   root   1796 Aug 25 15:50 database.py
-rw-r--r-- 1 root   root    834 Aug 25 15:50 hash.py
-rwxr-xr-x 1 root   root     73 Aug 25 15:50 init.sh
-rw-r--r-- 1 root   root     95 Aug 25 15:50 requirements.txt
-rw-r--r-- 1 root   root    601 Aug 25 15:50 settings.py
-rw-r--r-- 1 root   root   2253 Aug 25 15:50 setup.py
-rwxr-xr-x 1 root   root    158 Aug 25 15:50 start.sh
-rw-r--r-- 1 root   root    607 Aug 25 15:50 teardown.py
-rw-r--r-- 1 root   root   5281 Aug 25 15:50 verify.py