fix: [CI-14073]: Print absolute lookup path incase dockerfile not present (#163)

.harness/harness.yaml

@@ -37,7 +37,7 @@ pipeline:
                       identifier: Build
                       spec:
                         connectorRef: Plugins_Docker_Hub_Connector
-                        image: golang:1.23.0
+                        image: golang:1.24.11
                         shell: Sh
                         command: |-
                           go test ./...
@@ -322,7 +322,7 @@ pipeline:
                       identifier: Build_and_Test
                       spec:
                         connectorRef: Plugins_Docker_Hub_Connector
-                        image: golang:1.23.0
+                        image: golang:1.24.11
                         shell: Sh
                         command: |-
                           go test ./...

go.mod

@@ -58,6 +58,4 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
-go 1.23.0
-
-toolchain go1.23.8
+go 1.24.11

kaniko.go

@@ -227,7 +227,15 @@ func (p Plugin) Exec() error {
 	}
 
 	if _, err := os.Stat(p.Build.Dockerfile); os.IsNotExist(err) {
-		return fmt.Errorf("dockerfile does not exist at path: %s", p.Build.Dockerfile)
+
+		// Get absolute path for better error message. If path is empty, this will
+		// return the current working directory, showing where the plugin looked.
+		absPath, absErr := filepath.Abs(p.Build.Dockerfile)
+		if absErr != nil {
+			absPath = p.Build.Dockerfile
+		}
+
+		return fmt.Errorf("dockerfile does not exist at path: %s", absPath)
 	}
 
 	var tags = p.Build.Tags