cmd/nginx-auth: build for arm64

Fixes https://github.com/tailscale/tailscale/issues/6978

Signed-off-by: Denton Gentry <dgentry@tailscale.com>

cmd/nginx-auth/mkdeb.sh

@@ -2,30 +2,31 @@
 
 set -e
 
-CGO_ENABLED=0 GOARCH=amd64 GOOS=linux go build -o tailscale.nginx-auth .
+VERSION=0.1.3
+for ARCH in amd64 arm64; do
+    CGO_ENABLED=0 GOARCH=${ARCH} GOOS=linux go build -o tailscale.nginx-auth .
 
-VERSION=0.1.2
-
-mkpkg \
-    --out=tailscale-nginx-auth-${VERSION}-amd64.deb \
+    mkpkg \
+        --out=tailscale-nginx-auth-${VERSION}-${ARCH}.deb \
         --name=tailscale-nginx-auth \
         --version=${VERSION} \
         --type=deb \
-    --arch=amd64 \
+        --arch=${ARCH} \
         --postinst=deb/postinst.sh \
         --postrm=deb/postrm.sh \
         --prerm=deb/prerm.sh \
         --description="Tailscale NGINX authentication protocol handler" \
         --files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service,./README.md:/usr/share/tailscale/nginx-auth/README.md
 
-mkpkg \
-    --out=tailscale-nginx-auth-${VERSION}-amd64.rpm \
+    mkpkg \
+        --out=tailscale-nginx-auth-${VERSION}-${ARCH}.rpm \
         --name=tailscale-nginx-auth \
         --version=${VERSION} \
         --type=rpm \
-    --arch=amd64 \
+        --arch=${ARCH} \
         --postinst=rpm/postinst.sh \
         --postrm=rpm/postrm.sh \
         --prerm=rpm/prerm.sh \
         --description="Tailscale NGINX authentication protocol handler" \
         --files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service,./README.md:/usr/share/tailscale/nginx-auth/README.md
+done