src: fix env-file flag to ignore spaces before quotes

Fix to ignore spaces between '=' and quoted string in env file

Fixes: nodejs#53461

Signed-off-by: Mohit Malhotra <dev.mohitmalhotra@gmail.com>
PR-URL: nodejs#53786
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>

src/node_dotenv.cc

@@ -129,6 +129,7 @@ void Dotenv::ParseContent(const std::string_view input) {
     key = content.substr(0, equal);
     content.remove_prefix(equal + 1);
     key = trim_spaces(key);
+    content = trim_spaces(content);
 
     if (key.empty()) {
       break;

test/fixtures/dotenv/valid.env

@@ -38,6 +38,7 @@ RETAIN_INNER_QUOTES={"foo": "bar"}
 RETAIN_INNER_QUOTES_AS_STRING='{"foo": "bar"}'
 RETAIN_INNER_QUOTES_AS_BACKTICKS=`{"foo": "bar's"}`
 TRIM_SPACE_FROM_UNQUOTED=    some spaced out string
+SPACE_BEFORE_DOUBLE_QUOTES=   "space before double quotes"
 EMAIL=therealnerdybeast@example.tld
     SPACED_KEY = parsed
 EDGE_CASE_INLINE_COMMENTS="VALUE1" # or "VALUE2" or "VALUE3"

test/parallel/test-dotenv.js

@@ -80,3 +80,5 @@ assert.strictEqual(process.env.DONT_EXPAND_UNQUOTED, 'dontexpand\\nnewlines');
 assert.strictEqual(process.env.DONT_EXPAND_SQUOTED, 'dontexpand\\nnewlines');
 // Ignore export before key
 assert.strictEqual(process.env.EXPORT_EXAMPLE, 'ignore export');
+// Ignore spaces before double quotes to avoid quoted strings as value
+assert.strictEqual(process.env.SPACE_BEFORE_DOUBLE_QUOTES, 'space before double quotes');