fix(build): Close gaps that resulted in lint stage failures

.github/workflows/main.yml

@@ -141,7 +141,7 @@ jobs:
           args: --verbose --locked --features no-boards -p riot-rs -p riot-rs-boards -p riot-rs-chips -p riot-rs-debug -p riot-rs-embassy -p riot-rs-macros -p riot-rs-random -p riot-rs-rt -p riot-rs-threads -p riot-rs-utils
 
       - name: rustdoc
-        run: RUSTDOCFLAGS='-D warnings' cargo doc -p riot-rs --features no-boards,bench,external-interrupts,threading,random,csprng,hwrng,coap
+        run: RUSTDOCFLAGS='-D warnings' cargo doc -p riot-rs --features no-boards,bench,external-interrupts,threading,random,csprng,hwrng,coap,net,usb-ethernet
 
       - name: rustfmt
         run: cargo fmt --check --all

src/riot-rs-coap/Cargo.toml

@@ -8,7 +8,7 @@ repository.workspace = true
 [dependencies]
 coapcore.path = "../lib/coapcore"
 riot-rs-random = { path = "../riot-rs-random", features = ["csprng"] }
-riot-rs-embassy.path = "../riot-rs-embassy"
+riot-rs-embassy = { path = "../riot-rs-embassy", features = ["udp"] }
 
 # actually patched with https://github.com/smoltcp-rs/smoltcp/pull/904 but
 # patch.crates-io takes care of that

src/riot-rs-embassy/Cargo.toml

@@ -166,3 +166,7 @@ defmt = [
 # usb peripheral support.
 stm32-usb = []
 stm32-usb-synopsis = []
+
+# Made available so that downsteram crates such as riot-rs-coap don't need to
+# pull in embassy-net just to enable a feature they use through a pub-use.
+udp = ["net", "embassy-net/udp"]