diff --git a/.forgejo/workflows/builder-image/Dockerfile b/.forgejo/workflows/builder-image/Dockerfile
new file mode 100644
index 0000000..54181c2
--- /dev/null
+++ b/.forgejo/workflows/builder-image/Dockerfile
@@ -0,0 +1,7 @@
+FROM rust:latest
+RUN cargo install cross
+
+# This is necessary for cross to be able to access /var/run/docker.sock
+COPY --from=docker:dind /usr/local/bin/docker /usr/local/bin/
+
+RUN curl -fsSL https://deb.nodesource.com/setup_20.x -o nodesource_setup.sh && bash nodesource_setup.sh && rm -f nodesource_setup.sh && apt -y install nodejs && apt clean
diff --git a/.forgejo/workflows/builder-image/build-and-push.sh b/.forgejo/workflows/builder-image/build-and-push.sh
new file mode 100755
index 0000000..17a607f
--- /dev/null
+++ b/.forgejo/workflows/builder-image/build-and-push.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# You need to have already logged in:
+#
+#     docker login git.syndicate-lang.org
+#
+# Use a token with read-only access to user scope, this seems to be sufficient (!)
+
+set -e
+docker build -t git.syndicate-lang.org/syndicate-lang/rust-builder .
+docker push git.syndicate-lang.org/syndicate-lang/rust-builder