.env file when are quotes required

 https://stackoverflow.com/questions/71538752/when-are-quotes-needed-in-env-file

Use the quotation marks when the string contains spaces or certain special character and certain syntaxes. These include:

• space and other whitespace,

• backslash (escapes a space and newline – \  gives space even in unquoted string),

• quotation marks (but you can combine multiple quotation mark\ 'styles like'"this"),

• pound sign (#) that marks start of comment (if it is not in quotes string or $(…)),

• dollar sign (that is used to expand a variable – see below),

• parentheses (( and )) – depending on context,

• shell redirection chars (>, <, 2>, | etc.),

• asterisk (*) and question mark (?), since it is used in globs,

• square brackets (because they list characters),

• comma-separated text in {…} (because it provides multiple variants of text – {foo,bar}baz expands to foobaz barbaz),

• maybe others,

• and of course, the newline.