chore: add commit hash file to the built docker image

.github/workflows/container-images-cd.yml

@@ -62,6 +62,10 @@ jobs:
               id: aws-ecr
               uses: aws-actions/amazon-ecr-login@v1
 
+            - name: Get current commit hash
+              id: commit_hash
+              run: echo "::set-output name=hash::$(git rev-parse HEAD)"
+
             - name: Build and push container image
               id: build
               uses: depot/build-push-action@v1
@@ -70,6 +74,7 @@ jobs:
                   push: true
                   tags: posthog/posthog:${{ github.sha }},posthog/posthog:latest,${{ steps.aws-ecr.outputs.registry }}/posthog-cloud:master
                   platforms: linux/arm64,linux/amd64
+                  build-args: COMMIT_HASH=${{ steps.commit_hash.outputs.hash }}
 
             - name: Build and push unit container image
               id: build-unit
@@ -80,6 +85,7 @@ jobs:
                   file: production-unit.Dockerfile
                   tags: ${{ steps.aws-ecr.outputs.registry }}/posthog-cloud:unit
                   platforms: linux/amd64
+                  build-args: COMMIT_HASH=${{ steps.commit_hash.outputs.hash }}
 
             - name: get deployer token
               id: deployer

production-unit.Dockerfile

@@ -168,6 +168,10 @@ RUN groupadd -g 1000 posthog && \
     chown posthog:posthog /code
 USER posthog
 
+# Add the commit hash
+ARG COMMIT_HASH
+RUN echo $COMMIT_HASH > /code/commit.txt
+
 # Add in the compiled plugin-server & its runtime dependencies from the plugin-server-build stage.
 COPY --from=plugin-server-build --chown=posthog:posthog /code/plugin-server/dist /code/plugin-server/dist
 COPY --from=plugin-server-build --chown=posthog:posthog /code/plugin-server/node_modules /code/plugin-server/node_modules

production.Dockerfile

@@ -1,7 +1,7 @@
 #
 # This Dockerfile is used for self-hosted production builds.
 #
-# PostHog has sunset support for self-hosted K8s deployments. 
+# PostHog has sunset support for self-hosted K8s deployments.
 # See: https://posthog.com/blog/sunsetting-helm-support-posthog
 #
 # Note: for PostHog Cloud remember to update ‘Dockerfile.cloud’ as appropriate.
@@ -168,6 +168,10 @@ RUN groupadd -g 1000 posthog && \
     chown posthog:posthog /code
 USER posthog
 
+# Add the commit hash
+ARG COMMIT_HASH
+RUN echo $COMMIT_HASH > /code/commit.txt
+
 # Add in the compiled plugin-server & its runtime dependencies from the plugin-server-build stage.
 COPY --from=plugin-server-build --chown=posthog:posthog /code/plugin-server/dist /code/plugin-server/dist
 COPY --from=plugin-server-build --chown=posthog:posthog /code/plugin-server/node_modules /code/plugin-server/node_modules