Is distributing binaries or container images of an open source project considered as making it available on the market?

No. Monetization by the original manufacturer is what determines whether a product is made available on the market. As per Recital 18, merely supplying open source components isn’t indicative of a commercial activity:

Furthermore, the supply of products with digital elements qualifying as free and open-source software components intended for integration by other manufacturers into their own products with digital elements should be considered to be making available on the market only if the component is monetised by its original manufacturer. […] In addition, the mere presence of regular releases should not in itself lead to the conclusion that a product with digital elements is supplied in the course of a commercial activity.