remove all-features devshell

It's no longer necessary since it's equivalent to the default-features
one now. The `DIRENV_DEVSHELL` thing is left in place however in case
that becomes useful again in the future.

bin/nix-build-and-cache

@@ -51,7 +51,6 @@ ci() {
 
         # Keep sorted
         "$toplevel#devShells.x86_64-linux.default"
-        "$toplevel#devShells.x86_64-linux.all-features"
         attic#default
         nixpkgs#direnv
         nixpkgs#jq

engage.toml

@@ -88,21 +88,6 @@ name = "cargo-clippy/default"
 group = "lints"
 script = "cargo clippy --workspace --all-targets --color=always -- -D warnings"
 
-[[task]]
-name = "cargo-clippy/all"
-group = "lints"
-script = """
-env DIRENV_DEVSHELL=all-features \
-    direnv exec . \
-    cargo clippy \
-        --workspace \
-        --all-targets \
-        --all-features \
-        --color=always \
-        -- \
-        -D warnings
-"""
-
 [[task]]
 name = "cargo/default"
 group = "tests"
@@ -114,18 +99,3 @@ cargo test \
     -- \
     --color=always
 """
-
-[[task]]
-name = "cargo/all"
-group = "tests"
-script = """
-env DIRENV_DEVSHELL=all-features \
-    direnv exec . \
-    cargo test \
-        --all-features \
-        --workspace \
-        --all-targets \
-        --color=always \
-        -- \
-        --color=always
-"""

flake.nix

@@ -121,9 +121,6 @@
           );
 
         devShells.default = (mkScope pkgs).shell;
-        devShells.all-features = ((mkScope pkgs).overrideDefaultPackage {
-          all-features = true;
-        }).shell;
       }
     )
     //