CI: add toolchain matrix · RGB-Tools/rgb-lib@e445ea7

src/wallet/test/mod.rs#L22

unused import: `crate::utils::INDEXER_STOP_GAP`

src/wallet/test/mod.rs#L22

unused import: `crate::utils::INDEXER_STOP_GAP`

src/wallet/test/mod.rs#L22

unused import: `crate::utils::INDEXER_STOP_GAP`

src/wallet/test/mod.rs#L2

unused import: `ffi::OsString`

src/wallet/test/mod.rs#L9

unused import: `ifaces::rgb21::EmbeddedMedia as RgbEmbeddedMedia`

src/wallet/test/mod.rs#L13

unused import: `rgbstd::stl::ProofOfReserves as RgbProofOfReserves`

src/wallet/test/mod.rs#L15

unused import: `serial`

src/wallet/test/mod.rs#L24

unused imports: `AssetColoringInfo`, `ColoringInfo`, `RGB_RUNTIME_DIR`, `ScryptParams`, `database::entities::transfer_transport_endpoint`, `recipient_id_from_script_buf`, and `script_buf_from_recipient_id`

src/wallet/test/create_utxos.rs#L1

unused import: `super::*`

src/wallet/test/delete_transfers.rs#L1

unused import: `super::*`

src/wallet/test/drain_to.rs#L1

unused import: `super::*`

src/wallet/test/export_contract.rs#L1

unused import: `super::*`

src/wallet/test/fail_transfers.rs#L1

unused import: `super::*`

src/wallet/test/mod.rs#L2

unused import: `ffi::OsString`

src/wallet/test/mod.rs#L9

unused import: `ifaces::rgb21::EmbeddedMedia as RgbEmbeddedMedia`

src/wallet/test/mod.rs#L13

unused import: `rgbstd::stl::ProofOfReserves as RgbProofOfReserves`

src/wallet/test/mod.rs#L24

unused imports: `AssetColoringInfo`, `ColoringInfo`, `RGB_RUNTIME_DIR`, `ScryptParams`, `database::entities::transfer_transport_endpoint`, `recipient_id_from_script_buf`, and `script_buf_from_recipient_id`

src/wallet/test/create_utxos.rs#L1

unused import: `super::*`

src/wallet/test/delete_transfers.rs#L1

unused import: `super::*`

src/wallet/test/drain_to.rs#L1

unused import: `super::*`

src/wallet/test/export_contract.rs#L1

unused import: `super::*`

src/wallet/test/fail_transfers.rs#L1

unused import: `super::*`

src/wallet/test/get_btc_balance.rs#L1

unused import: `super::*`