Add DB diagram function to Makefile

[michplunkett]

Fixes issue

#1060

Description of Changes

Added a command to the Makefile that generates a DB relationship diagram.

Tests and Linting

• This branch is up-to-date with the develop branch.
• Ran make create_db_diagram command.
• pytest passes on my local development environment.
• pre-commit passes on my local development environment.
• Validated edge cases for make create_db_diagram.

(env) michaelp@Mac OpenOversight % rm database/schema.dot
(env) michaelp@Mac OpenOversight % make create_db_diagram
# Create new dot file showing current version of schema
eralchemy -i postgresql://openoversight:terriblepassword@localhost/openoversight-dev -o database/schema.new.dot
# Sort new version of schema file
sort database/schema.new.dot -o schema.new.dot.sorted
# Create old schema file if it does not exist and then sort it
touch database/schema.dot
sort database/schema.dot -o schema.dot.sorted
# Create a new diagram if there are changes, otherwise clean up files
Detected schema changes, making new DB relationship diagram!
# Remove all sorted files
rm schema.dot.sorted schema.new.dot.sorted
(env) michaelp@Mac OpenOversight % make create_db_diagram
# Create new dot file showing current version of schema
eralchemy -i postgresql://openoversight:terriblepassword@localhost/openoversight-dev -o database/schema.new.dot
# Sort new version of schema file
sort database/schema.new.dot -o schema.new.dot.sorted
# Create old schema file if it does not exist and then sort it
touch database/schema.dot
sort database/schema.dot -o schema.dot.sorted
# Create a new diagram if there are changes, otherwise clean up files
No schema changes detected!
# Remove all sorted files
rm schema.dot.sorted schema.new.dot.sorted
(env) michaelp@Mac OpenOversight %

[michplunkett]

graphviz-dev adds all of the C packages needed to compile graphviz.