feat(build): add negative build flags to compile squix without a set of database drivers

[eduardofuncao]

No description provided.

[Copilot]

Copilot review overview

🟡 Changes recommended

Moderate issues remain in CGO/negative-tag reporting, local full builds, and error propagation.

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Review effort: Lite
Findings: 2

Open (2)

• Driver diagnostic falsely attributes CGO exclusion to noduckdb tag · New
• Missing-driver remediation ignores CGO-based DuckDB exclusion · New

What changed in this PR

Adds build-time database-driver variants and runtime reporting of compiled driver support.

Changes:

• Adds per-driver negative build tags and conditional registration.
• Adds full, lite, and minimal build targets across local, Nix, and release workflows.
• Adds squix --drivers and documents driver availability.

File	Reviewed change
README.md	Links to build variant documentation.
Makefile	Adds lite and minimal targets.
internal/​db/​sqlserver_connection.go	Adds conditional SQL Server driver compilation.
internal/​db/​sqlite_connection.go	Adds conditional SQLite driver compilation.
internal/​db/​snowflake_connection.go	Adds conditional Snowflake driver compilation.
internal/​db/​postgres_connection.go	Adds conditional PostgreSQL driver compilation.
internal/​db/​oracle_connection.go	Adds conditional Oracle driver compilation.
internal/​db/​mysql_connection.go	Adds conditional MySQL driver compilation.
internal/​db/​inference.go	Reports compiled drivers.
internal/​db/​firebird_connection.go	Adds conditional Firebird driver compilation.
internal/​db/​duckdb_connection.go	Adds conditional DuckDB driver compilation.
internal/​db/​duckdb_connection_stub.go	Removes the obsolete DuckDB stub.
internal/​db/​connection_factory.go	Centralizes conditional driver creation.
internal/​db/​clickhouse_connection.go	Adds conditional ClickHouse driver compilation.
flake.nix	Adds Nix build variants.
docs/​features.md	Documents variants and driver coverage.
cmd/​squix/​drivers.go	Adds driver availability output.
cmd/​squix/​app.go	Registers the --drivers command.
build-local.sh	Builds local variants.
.github/​workflows/​release.yml	Builds and publishes variant releases.

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