tests: gate e2e tests behind required-features flag

cargo test --workspace no longer runs the e2e binary by default,
since rage and passage won't be installed in most dev environments.

Author: mhluongo

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
       - name: Build plugin binary
         run: cargo build -p age-plugin-argon2-cli
       - name: Run e2e tests
-        run: cargo test --test e2e
+        run: cargo test -p age-plugin-argon2-cli --features e2e --test e2e
 
   deny:
     runs-on: ubuntu-latest

age-plugin-argon2-cli/Cargo.toml

@@ -19,6 +19,13 @@ clap = { version = "4", features = ["derive"] }
 secrecy = "0.10"
 thiserror = "1.0"
 
+[features]
+e2e = []
+
+[[test]]
+name = "e2e"
+required-features = ["e2e"]
+
 [dev-dependencies]
 tempfile = "3"
 rexpect = "0.6"