diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ae3c172
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/bin/
diff --git a/Dockerfile b/Dockerfile
index 7396c8c..e4da152 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,21 @@
 
 FROM focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
 
-# TODO: install joj3 & other binarys
-# TODO: install joint-teapot
-# TODO: install elf
+# install elm
+RUN curl -L -o elm.gz https://mirror.ghproxy.com/https://github.com/elm/compiler/releases/download/0.19.1/binary-for-linux-64-bit.gz \
+    && gunzip elm.gz \
+    && chmod +x elm \
+    && mv elm /usr/local/bin/
+
+# install elm-format
+RUN curl -L -o elm-format.tgz https://mirror.ghproxy.com/https://github.com/avh4/elm-format/releases/download/0.8.7/elm-format-0.8.7-linux-x64.tgz \
+    && tar -xvf elm-format.tgz \
+    && chmod +x elm-format \
+    && mv elm-format /usr/local/bin/
+
+# install joint-teapot
+RUN pip install git+https://mirror.ghproxy.com/https://github.com/BoYanZh/Joint-Teapot
+
+# TODO: install elf & joj3 & other binarys
+
+COPY bin/* /usr/local/bin/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..551d56b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+.PHONY: all build
+
+all: build
+
+build:
+	docker build -t focs.ji.sjtu.edu.cn:5000/gitea/runner-images:focs-ubuntu-latest .
diff --git a/README.md b/README.md
index ce9bf1a..9745e83 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,7 @@
 FOCS docker images used by [act_runner](https://gitea.com/gitea/act_runner) to run workflows.
 
 Check <https://gitea.com/gitea/runner-images> for information about base images.
+
+## `/bin` directory
+
+Currently, we have placed various binary files in the `/bin` directory that cannot be publicly downloaded. These files include `dummy`, `elf`, `healthcheck`, and `joj3` for now.