diff --git a/Dockerfile b/Dockerfile
index 19cdacc..9f16427 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,12 @@
 FROM node:18-bullseye-slim
 WORKDIR /app
 COPY package*.json ./
-COPY .git ./
-RUN apt-get update && apt-get install -y git && rm -rf /var/lib/apt/lists/*
+ARG GIT_COMMIT
+RUN apt-get update
+RUN apt-get install -y git
+RUN rm -rf /var/lib/apt/lists/*
 RUN npm install
+RUN git clone -n https://github.com/wukko/cobalt.git --depth 1 && cd cobalt && git checkout ${GIT_COMMIT} ./
 COPY . .
 EXPOSE 9000
 CMD [ "node", "src/cobalt" ]
diff --git a/src/modules/sub/currentCommit.js b/src/modules/sub/currentCommit.js
index f3c145f..7f44c1b 100644
--- a/src/modules/sub/currentCommit.js
+++ b/src/modules/sub/currentCommit.js
@@ -4,6 +4,7 @@ let commit, commitInfo, branch;
 
 export function shortCommit() {
     if (commit) return commit;
+    if (process.env.GIT_COMMIT) return process.env.GIT_COMMIT;
     let c = execSync('git rev-parse --short HEAD').toString().trim();
     commit = c;
     return c
@@ -17,6 +18,7 @@ export function getCommitInfo() {
 }
 export function getCurrentBranch() {
     if (branch) return branch;
+    if (process.env.GIT_BRANCH) return process.env.GIT_BRANCH;
     let b = execSync('git branch --show-current').toString().trim();
     branch = b;
     return b