[WIP] elliptic-curve: re-enable CI minimal-versions check

Note: it appears the `hkdf` requirement is misspecified and needs to be
bumped to v0.12.1. I'll do that once confirming the problem is now
caught in CI.

.github/workflows/elliptic-curve.yml

@@ -57,19 +57,17 @@ jobs:
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features arithmetic,serde
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,digest,ecdh,hazmat,hash2curve,jwk,pem,pkcs8,sec1,serde,voprf
 
-  # TODO: use the reusable workflow after this crate is re-added to the
-  # toplevel workspace
-  # minimal-versions:
-  #   runs-on: ubuntu-latest
-  #   steps:
-  #     - uses: actions/checkout@v4
-  #     - uses: RustCrypto/actions/cargo-cache@master
-  #     - uses: dtolnay/rust-toolchain@master
-  #       with:
-  #         toolchain: nightly
-  #     - uses: RustCrypto/actions/cargo-hack-install@master
-  #     - run: cargo update -Z minimal-versions
-  #     - run: cargo hack test --release --feature-powerset
+  minimal-versions:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly
+      - uses: RustCrypto/actions/cargo-hack-install@master
+      - run: cargo update -Z minimal-versions
+      - run: cargo build --release --features ecdh,hash2curve,pem,std,voprf # TODO(tarcieri): test all features
 
   test:
     runs-on: ubuntu-latest