CI: Add the test/openssl/test_pkey.rb on the FIPS mode case.

It's to test the `OpenSSL::PKey.read` in the `test/openssl/test_pkey.rb` except
the `test_ed25519`, `test_x25519` and `test_compare?` on the FIPS mode case.

I added the pending status to these 3 tests above coming from other issues on
the FIPS mode.

.github/workflows/test.yml

@@ -135,3 +135,12 @@ jobs:
       - name: test
         run:  rake test TESTOPTS="-v --no-show-detail-immediately" OSSL_MDEBUG=1
         timeout-minutes: 5
+        if: ${{ !matrix.fips_enabled }}
+
+      # Run only the passing tests on the FIPS mode as a temporary workaround.
+      # TODO Fix other tests, and run all the tests on FIPS mode.
+      - name: test on fips mode
+        run:  |
+          ruby -Ilib test/openssl/test_fips.rb && \
+          ruby -Ilib test/openssl/test_pkey.rb
+        if: matrix.fips_enabled

test/openssl/test_pkey.rb

@@ -82,6 +82,9 @@ def test_hmac_sign_verify
   end
 
   def test_ed25519
+    # https://github.com/openssl/openssl/issues/20758
+    pend('Not supported on FIPS mode enabled') if OpenSSL.fips_mode
+
     # Test vector from RFC 8032 Section 7.1 TEST 2
     priv_pem = <<~EOF
     -----BEGIN PRIVATE KEY-----
@@ -127,6 +130,8 @@ def test_ed25519
   end
 
   def test_x25519
+    pend('Not supported on FIPS mode enabled') if OpenSSL.fips_mode
+
     # Test vector from RFC 7748 Section 6.1
     alice_pem = <<~EOF
     -----BEGIN PRIVATE KEY-----
@@ -153,6 +158,8 @@ def test_x25519
   end
 
   def test_compare?
+    pend('Not supported on FIPS mode enabled') if OpenSSL.fips_mode
+
     key1 = Fixtures.pkey("rsa1024")
     key2 = Fixtures.pkey("rsa1024")
     key3 = Fixtures.pkey("rsa2048")