Fix .env generation with multiline, like private key

main.sh

@@ -53,17 +53,13 @@ COMMIT_SHORT=$(head -c 8 <<<$CODEBUILD_RESOLVED_SOURCE_VERSION)
 IMAGE_NAME=$AWS_ACCOUNT_ID.dkr.ecr.$AWS_REGION.amazonaws.com/$REPO_SLUG-$BRANCH:$COMMIT_SHORT
 
 main_application_secrets=$(aws secretsmanager get-secret-value --secret-id $BRANCH/$REPO_SLUG)
-main_application_environment_variables=$(jq -r '.SecretString | fromjson | to_entries | .[] | .key + "=" + (.value|tostring)' <<<$main_application_secrets)
-main_export_regex="^([A-Z0-9_])+[=]+(.*)"
-for ENV_LINE in $main_application_environment_variables; do
-    if [[ $ENV_LINE =~ ${main_export_regex} ]]; then
-        export $ENV_LINE
-        echo $ENV_LINE >> .env
-    else
-        echo "   SKIPPED: >> ${ENV_LINE}"
-        main_export_errors=true
-    fi
-done
+main_application_environment_variables=$(jq -r '.SecretString | fromjson | to_entries[] | "\(.key)=\(.value|tostring)"' <<<$main_application_secrets)
+
+while IFS= read -r ENV_LINE; do
+    export "$ENV_LINE"
+    echo "$ENV_LINE" >> .env
+done <<< "$main_application_environment_variables"
+
 
 if [ ! -z "$main_export_errors" ]; then
     echo "    WARNING: The above noted environment variables were skipped from the export, as they were not identified as a valid value or by a flag."