Watch: Clear vars cache between runs

Closes #365

internal/compiler/compiler.go

@@ -9,4 +9,5 @@ import (
 type Compiler interface {
 	GetVariables(t *taskfile.Task, call taskfile.Call) (*taskfile.Vars, error)
 	HandleDynamicVar(v taskfile.Var) (string, error)
+	ResetCache()
 }

internal/compiler/v2/compiler_v2.go

@@ -109,3 +109,11 @@ func (c *CompilerV2) HandleDynamicVar(v taskfile.Var) (string, error) {
 
 	return result, nil
 }
+
+// ResetCache clear the dymanic variables cache
+func (c *CompilerV2) ResetCache() {
+	c.muDynamicCache.Lock()
+	defer c.muDynamicCache.Unlock()
+
+	c.dynamicCache = nil
+}

internal/compiler/v3/compiler_v3.go

@@ -96,3 +96,11 @@ func (c *CompilerV3) HandleDynamicVar(v taskfile.Var) (string, error) {
 
 	return result, nil
 }
+
+// ResetCache clear the dymanic variables cache
+func (c *CompilerV3) ResetCache() {
+	c.muDynamicCache.Lock()
+	defer c.muDynamicCache.Unlock()
+
+	c.dynamicCache = nil
+}