chore: update Dockerfile for fork ownership

- Bump builder to golang:1.25-alpine to match go.mod
- Fix ldflags module path to github.com/lucasmodrich/git-sync
- Update maintainer label

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: lucasmodrich

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.24.5-alpine AS builder
+FROM golang:1.25-alpine AS builder
 
 WORKDIR /go/src/app
 
@@ -18,14 +18,14 @@ RUN go mod download \
 
 COPY . /go/src/app/
 
-RUN go build -a -installsuffix cgo -ldflags="-w -s -X github.com/AkashRajpurohit/git-sync/pkg/version.Version=${VERSION} -X github.com/AkashRajpurohit/git-sync/pkg/version.Build=${BUILD}" -o git-sync . \
+RUN go build -a -installsuffix cgo -ldflags="-w -s -X github.com/lucasmodrich/git-sync/pkg/version.Version=${VERSION} -X github.com/lucasmodrich/git-sync/pkg/version.Build=${BUILD}" -o git-sync . \
   && upx -q git-sync
 
 # Application image
 FROM alpine:latest
 WORKDIR /opt/go
 
-LABEL maintainer="AkashRajpurohit <me@akashrajpurohit.com>"
+LABEL maintainer="Lucas Modrich"
 
 # Install git since it's required for the application
 RUN apk add --no-cache git su-exec