Add push-only support

.harness/harness.yaml

@@ -33,7 +33,7 @@ pipeline:
                   identifier: Run_1
                   spec:
                     connectorRef: Plugins_Docker_Hub_Connector
-                    image: golang:1.24.11
+                    image: golang:1.23.0
                     shell: Sh
                     command: go vet ./...
               - step:
@@ -42,7 +42,7 @@ pipeline:
                   identifier: Run_2
                   spec:
                     connectorRef: Plugins_Docker_Hub_Connector
-                    image: golang:1.24.11
+                    image: golang:1.23.0
                     shell: Sh
                     command: go test -cover ./...
     - parallel:
@@ -70,7 +70,7 @@ pipeline:
                       identifier: Build_Push
                       spec:
                         connectorRef: Plugins_Docker_Hub_Connector
-                        image: golang:1.24.11
+                        image: golang:1.23.0
                         shell: Sh
                         command: go build -a -tags netgo -o release/linux/amd64/drone-<+matrix.repo> ./cmd/drone-<+matrix.repo>
                         envVariables:
@@ -157,7 +157,7 @@ pipeline:
                       identifier: buildpush
                       spec:
                         connectorRef: Plugins_Docker_Hub_Connector
-                        image: golang:1.24.11
+                        image: golang:1.23.0
                         shell: Sh
                         command: go build -a -tags netgo -o release/linux/arm64/drone-<+matrix.repo> ./cmd/drone-<+matrix.repo>
                         envVariables:

cmd/drone-docker/main.go

@@ -33,7 +33,7 @@ func main() {
 		cli.BoolFlag{
 			Name:   "dry-run",
 			Usage:  "dry run disables docker push",
-			EnvVar: "PLUGIN_DRY_RUN, PLUGIN_NO_PUSH",
+			EnvVar: "PLUGIN_DRY_RUN",
 		},
 		cli.StringFlag{
 			Name:   "remote.url",