ci: add cargo hack feature powerset daily test

This commit adds the `cargo hack` feature powerset test task we use in
the Rustls daily tasks CI to the new webpki daily tasks CI. This will
let us catch feature related breakages earlier while also avoiding long
runtime for the normal CI processes.

Author: cpu

.github/workflows/daily-tests.yml

@@ -44,3 +44,21 @@ jobs:
         run: cargo test -- --ignored
         env:
           RUST_BACKTRACE: 1
+
+  feature-powerset:
+    name: Feature Powerset
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install stable toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install cargo hack
+        uses: taiki-e/install-action@cargo-hack
+
+      - name: Check feature powerset
+        run: cargo hack check --feature-powerset --no-dev-deps