Encapsulate all values into single quotes

will be more future proof as it might not break
on values that contain whitespaces etc

Author: Bi0T1N

src/GitVersion.Output.Tests/Output/FormatArgumentTests.cs

@@ -68,13 +68,13 @@ public void ShouldOutputFormatWithEnvironmentVariablesTests(string format, strin
         output.ShouldBeEquivalentTo(expectedValue);
     }
 
-    [TestCase("Major", "1")]
-    [TestCase("MajorMinorPatch", "1.1.0")]
-    [TestCase("SemVer", "1.1.0-foo.1")]
-    [TestCase("PreReleaseTagWithDash", "-foo.1")]
-    [TestCase("AssemblySemFileVer", "1.1.0.0")]
-    [TestCase("BranchName", "feature/foo")]
-    [TestCase("FullSemVer", "1.1.0-foo.1+1")]
+    [TestCase("Major", "'1'")]
+    [TestCase("MajorMinorPatch", "'1.1.0'")]
+    [TestCase("SemVer", "'1.1.0-foo.1'")]
+    [TestCase("PreReleaseTagWithDash", "'-foo.1'")]
+    [TestCase("AssemblySemFileVer", "'1.1.0.0'")]
+    [TestCase("BranchName", "'feature/foo'")]
+    [TestCase("FullSemVer", "'1.1.0-foo.1+1'")]
     public void ShouldOutputDotEnvEntries(string variableName, string expectedValue)
     {
         var fixture = CreateTestRepository();
@@ -127,13 +127,13 @@ public void ShouldOutputAllCalculatedVariablesAsDotEnvEntries()
         Assert.That(totalOutputLines, Is.EqualTo(versionVariables.Count()));
     }
 
-    [TestCase("Major", "0")]
-    [TestCase("MajorMinorPatch", "0.0.1")]
-    [TestCase("SemVer", "0.0.1-1")]
+    [TestCase("Major", "'0'")]
+    [TestCase("MajorMinorPatch", "'0.0.1'")]
+    [TestCase("SemVer", "'0.0.1-1'")]
     [TestCase("BuildMetaData", "''")]
-    [TestCase("AssemblySemVer", "0.0.1.0")]
-    [TestCase("PreReleaseTagWithDash", "-1")]
-    [TestCase("BranchName", "main")]
+    [TestCase("AssemblySemVer", "'0.0.1.0'")]
+    [TestCase("PreReleaseTagWithDash", "'-1'")]
+    [TestCase("BranchName", "'main'")]
     [TestCase("PreReleaseLabel", "''")]
     [TestCase("PreReleaseLabelWithDash", "''")]
     public void ShouldOutputAllDotEnvEntriesEvenForMinimalRepositories(string variableName, string expectedValue)

src/GitVersion.Output/OutputGenerator/OutputGenerator.cs

@@ -40,12 +40,12 @@ public void Execute(GitVersionVariables variables, OutputContext context)
             foreach (var (key, value) in variables.OrderBy(x => x.Key))
             {
                 string prefixedKey = "GitVersion_" + key;
-                string environmentValue = "''";
+                string environmentValue = "";
                 if (!value.IsNullOrEmpty())
                 {
                     environmentValue = value;
                 }
-                dotEnvEntries.Add(prefixedKey + "=" + environmentValue);
+                dotEnvEntries.Add($"{prefixedKey}='{environmentValue}'");
             }
 
             foreach (var dotEnvEntry in dotEnvEntries)