new approach

.woodpecker.yml

@@ -7,7 +7,8 @@ when:
 
 variables:
   - &golang "golang:1.21"
-  - &build_plugin "woodpeckerci/plugin-docker-buildx:pull_130"
+  # - &build_plugin "woodpeckerci/plugin-docker-buildx:pull_130"
+  - &build_plugin "woodpeckerci/plugin-docker-buildx:3.0.0"
   - base_settings: &base_buildx_settings
       platforms: "linux/amd64,linux/arm64"
       dockerfile: Dockerfile.multiarch
@@ -76,6 +77,7 @@ steps:
 
   publish_pr_image:
     image: *build_plugin
+    pull: true
     depends_on: test
     settings:
       <<: *base_buildx_settings

plugin/docker.go

@@ -2,14 +2,12 @@ package plugin
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"os/exec"
 	"strconv"
 	"strings"
 	"time"
 
-	"github.com/go-git/go-git/v5"
 	"github.com/urfave/cli/v2"
 )
 
@@ -69,23 +67,8 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 	}
 
 	// determine git epoch to define SOURCE_DATE_EPOCH build_arg
-	r, err := git.PlainOpen(".")
-	if err != nil {
-		log.Fatal(err)
-	}
-	ref, err := r.Head()
-	if err != nil {
-		log.Fatal(err)
-	}
-	iter, err := r.Log(&git.LogOptions{From: ref.Hash()})
-	if err != nil {
-		log.Fatal(err)
-	}
-	commit, err := iter.Next()
-	if err != nil {
-		log.Fatal(err)
-	}
-	build.Epoch = commit.Author.When.Unix()
+	now := time.Now()
+	build.Epoch = now.Unix()
 
 	args = append(args, build.Context)
 	if !dryrun {