use access token for gitea

Dockerfile

@@ -8,10 +8,12 @@ FROM golang:1.20-alpine as builder
 
 RUN apk add --no-cache gcc musl-dev binutils-gold linux-headers git
 
-# FIXME - setup for dev deps
-RUN apk add --no-cache openssh
-COPY _dev/.ssh /root/.ssh
-COPY _dev/.gitconfig /root/
+# Configure creds for gitea
+ARG GITEA_TOKEN
+RUN echo $GITEA_TOKEN > ~/.token
+RUN git config --global credential.username _ # ignored, but prevents prompt
+RUN git config --global credential.helper \
+    '!f() { test "$1" = get && echo "password=$(cat $HOME/.token)"; }; f'
 
 # Get dependencies - will also be cached if we won't change go.mod/go.sum
 COPY go.mod /go-ethereum/