.github/workflows/test.yml: limit ossl building parallelism

"make -j" leads to unlimited concurrency during execution of the openssl
build step, which sometimes leads to failures due to resource exhaustion.
Try to avoid that by limiting the number of concurrently executed jobs
to 4, similarly to the way it is done elsewhere in the workflow steps
(including building openssl on FreeBSD).

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>

Author: esyr

.github/workflows/test.yml

@@ -68,7 +68,7 @@ jobs:
     - name: "Build openssl"
       working-directory: "./openssl"
       run: |
-        make -j
+        make -j 4
     - name: "Install openssl"
       working-directory: "./openssl"
       run: |
@@ -169,7 +169,7 @@ jobs:
     - name: "Build openssl"
       working-directory: "./openssl"
       run: |
-        make -j
+        make -j 4
     - name: "Install openssl"
       working-directory: "./openssl"
       run: |
@@ -508,7 +508,7 @@ jobs:
     - name: "Build openssl"
       working-directory: "./openssl"
       run: |
-        make -j
+        make -j 4
     - name: "Install openssl"
       working-directory: "./openssl"
       run: |