Roughly, this is what happens during a phar:build:
sequenceDiagram
participant D as Dev
participant S as Application Console
participant P as Phar
participant G as GitHub
D->>S: php bin/console phar:build
S->>G: Check dependencies like box and the php-scoper
G->>S: Download external tools if necessary
S->>P: Precompile the application container
S->>P: Merge and dump the current box configuration
S->>P: Run `box.phar compile`
S->>D: Build finished
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