avoid encryption tasks on non-encrypted builds

Author: aclark4life

.evergreen/config.yml

@@ -59,6 +59,17 @@ functions:
         args:
           - ./.evergreen/run-tests.sh
 
+  "run encryption tests":
+    - command: subprocess.exec
+      type: test
+      params:
+        binary: bash
+        working_dir: "src"
+        include_expansions_in_env: ["DRIVERS_TOOLS", "MONGODB_URI", "DJANGO_SETTINGS_MODULE", "CRYPT_SHARED_LIB_PATH"]
+        args:
+          - ./.evergreen/run-tests.sh
+          - encryption
+
   "teardown":
     - command: subprocess.exec
       params:
@@ -80,6 +91,10 @@ tasks:
     commands:
       - func: "run unit tests"
 
+  - name: run-encryption-tests
+    commands:
+      - func: "run encryption tests"
+
 buildvariants:
   - name: tests-6-noauth-nossl
     display_name: Run Tests 6.0 NoAuth NoSSL
@@ -133,4 +148,4 @@ buildvariants:
       TOPOLOGY: replica_set
       DJANGO_SETTINGS_MODULE: "encrypted_settings"
     tasks:
-      - name: run-tests
+      - name: run-encryption-tests

.evergreen/run-tests.sh

@@ -3,13 +3,21 @@
 set -eux
 
 # Export secrets as environment variables
-. ../secrets-export.sh
+if [[ "${1:-}" == "encryption" ]]; then
+    . ../secrets-export.sh
+fi
 
-# Install django-mongodb-backend
+# Set up virtual environment
 /opt/python/3.10/bin/python3 -m venv venv
 . venv/bin/activate
 python -m pip install -U pip
-pip install -e '.[encryption]'
+
+# Conditionally install encryption extra if "encryption" arg is passed
+if [[ "${1:-}" == "encryption" ]]; then
+    pip install -e '.[encryption]'
+else
+    pip install -e .
+fi
 
 # Install django and test dependencies
 git clone --branch mongodb-5.2.x https://github.com/mongodb-forks/django django_repo