x509-cert: add certificate builder (#764)

Author: baloo

.github/workflows/x509-cert.yml

@@ -38,12 +38,13 @@ jobs:
           toolchain: ${{ matrix.rust }}
           targets: ${{ matrix.target }}
       - uses: RustCrypto/actions/cargo-hack-install@master
-      - run: cargo hack build --target ${{ matrix.target }} --feature-powerset --exclude-features arbitrary,default,std
+      - run: cargo hack build --target ${{ matrix.target }} --feature-powerset --exclude-features arbitrary,builder,default,std
 
   minimal-versions:
     uses: RustCrypto/actions/.github/workflows/minimal-versions.yml@master
     with:
         working-directory: ${{ github.workflow }}
+        install-zlint: true
 
   test:
     runs-on: ubuntu-latest
@@ -59,6 +60,8 @@ jobs:
         with:
           toolchain: ${{ matrix.rust }}
       - uses: RustCrypto/actions/cargo-hack-install@master
+      - name: Install zlint
+        uses: RustCrypto/actions/zlint-install@master
       - run: cargo hack test --feature-powerset
 
   fuzz: