pgAdmin macOS Builds

Required Packages

Either build the sources or get them from macports or similar:

Yarn & NodeJS
PostgreSQL 12 or above from http://www.postgresql.org/
Python 3.6+ (required for building). The build environment should run this version of python in response to the python command.

To bundle a different version of Python from the default of 3.9.2, set the PGADMIN_PYTHON_VERSION environment variable, e.g:
```
export PGADMIN_PYTHON_VERSION=3.8.5
```
If a path different from the default of /usr/local/pgsql for the PostgreSQL installation has been used, set the PGADMIN_POSTGRES_DIR environment variable appropriately, e.g:
```
export PGADMIN_POSTGRES_DIR=/opt/local/pgsql
```
If you want to codesign the appbundle, copy codesign.conf.in to codesign.conf and set the values accordingly.
If you want to notarize the appbundle, copy notarization.conf.in to notarization.conf and set the values accordingly. Note that notarization will fail if the code isn't signed.
To build, go to pgAdmin4 source root directory and execute:
```
make appbundle
```
This will create the python virtual environment and install all the required python modules mentioned in the requirements file using pip, build the runtime code and finally create the app bundle and the DMG in ./dist directory.