Updated Dockerfile and woodpecker to use private Gitea login credentials

Dockerfile

@@ -1,6 +1,8 @@
 # syntax=docker/dockerfile:1.6
 
 ARG GO_VERSION=1.25
+ARG GITEA_USER
+ARG GITEA_TOKEN
 
 ############################
 # Build stage
@@ -8,6 +10,8 @@ ARG GO_VERSION=1.25
 FROM harbor.maximumdirect.net/proxy-dockerhub/golang:${GO_VERSION}-bookworm AS build
 
 WORKDIR /src
+ARG GITEA_USER
+ARG GITEA_TOKEN
 ENV GOPRIVATE=gitea.maximumdirect.net/ejr/* \
     GONOSUMDB=gitea.maximumdirect.net/ejr/*
 
@@ -19,7 +23,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # Cache dependencies first
 COPY go.mod go.sum ./
 RUN --mount=type=cache,target=/go/pkg/mod \
-    go mod download && go mod verify
+    if [ -n "${GITEA_USER}" ] && [ -n "${GITEA_TOKEN}" ]; then \
+      git config --global url."https://${GITEA_USER}:${GITEA_TOKEN}@gitea.maximumdirect.net/".insteadOf "https://gitea.maximumdirect.net/"; \
+    fi && \
+    go mod download && go mod verify && \
+    rm -f /root/.gitconfig
 
 # Copy the rest of the source
 COPY . .