docker: share image definitions between local docker compose and taskcluster (#3564)

The only real difference is the location of the source, which is under
topsrcdir in TC.  Use a build argument to deal with that.

Author: jcristau

Dockerfile

@@ -6,8 +6,10 @@ services:
   balrogadmin:
     build:
       context: .
+      dockerfile: taskcluster/docker/balrog-backend/Dockerfile
       args:
         PYTHON_VERSION: 3.13
+        SRC: .
     depends_on:
       balrogdb:
         condition: service_healthy
@@ -61,8 +63,10 @@ services:
   balrogpub:
     build:
       context: .
+      dockerfile: taskcluster/docker/balrog-backend/Dockerfile
       args:
         PYTHON_VERSION: 3.13
+        SRC: .
     depends_on:
       balrogdb:
         condition: service_healthy
@@ -100,9 +104,10 @@ services:
   balrogagent:
     build:
       context: .
-      dockerfile: agent/Dockerfile
+      dockerfile: taskcluster/docker/balrog-agent/Dockerfile
       args:
         PYTHON_VERSION: 3.13
+        SRC: .
     depends_on:
       nginx:
         condition: service_healthy

agent/Dockerfile

@@ -1,17 +1,18 @@
-# WARNING: keep this file in sync with agent/Dockerfile
-
 ARG PYTHON_VERSION=3.13
 FROM ghcr.io/astral-sh/uv:python${PYTHON_VERSION}-bookworm-slim AS builder
 
 WORKDIR /app
 
+# Use an arg so we can share the Dockerfile with docker compose
+ARG SRC=topsrcdir
+
 # %include pyproject.toml
 # %include uv.lock
 # %include README.rst
-COPY topsrcdir/pyproject.toml topsrcdir/uv.lock topsrcdir/README.rst /app/
+COPY ${SRC}/pyproject.toml ${SRC}/uv.lock ${SRC}/README.rst /app/
 
 # %include agent
-COPY topsrcdir/agent /app/agent
+COPY ${SRC}/agent /app/agent
 
 RUN uv venv
 RUN uv sync --package=balrogagent --frozen --no-dev
@@ -26,9 +27,9 @@ COPY --from=builder /app/.venv /app/.venv
 # %include agent/scripts
 # %include agent/src
 # %include agent/run.sh
-COPY topsrcdir/agent/scripts/ /app/scripts/
-COPY topsrcdir/agent/src /app/agent/src
-COPY topsrcdir/agent/run.sh /app
+COPY ${SRC}/agent/scripts/ /app/scripts/
+COPY ${SRC}/agent/src /app/agent/src
+COPY ${SRC}/agent/run.sh /app
 
 # Using /bin/bash as the entrypoint works around some volume mount issues on Windows
 # where volume-mounted files do not have execute bits set.

docker-compose.yml

@@ -1,5 +1,3 @@
-# WARNING: keep this file in sync with the main balrog Dockerfile
-
 ARG PYTHON_VERSION=3.13
 FROM ghcr.io/astral-sh/uv:python${PYTHON_VERSION}-bookworm-slim AS builder
 
@@ -10,12 +8,15 @@ WORKDIR /app
 RUN apt-get -q update \
     && apt-get -q --yes install g++ default-libmysqlclient-dev gcc pkg-config
 
+# Use a variable so we can share the Dockerfile with docker compose
+ARG SRC=topsrcdir
+
 # %include pyproject.toml
 # %include uv.lock
 # %include README.rst
-COPY topsrcdir/pyproject.toml topsrcdir/uv.lock topsrcdir/README.rst /app/
+COPY ${SRC}/pyproject.toml ${SRC}/uv.lock ${SRC}/README.rst /app/
 # %include src
-COPY topsrcdir/src/ /app/src/
+COPY ${SRC}/src/ /app/src/
 
 RUN uv venv
 RUN uv sync --no-dev --frozen
@@ -37,13 +38,13 @@ WORKDIR /app
 
 COPY --from=builder /app/.venv /app/.venv
 # %include src
-COPY topsrcdir/src/ /app/src/
+COPY ${SRC}/src/ /app/src/
 # %include scripts
-COPY topsrcdir/scripts/ /app/scripts/
+COPY ${SRC}/scripts/ /app/scripts/
 # %include uwsgi
-COPY topsrcdir/uwsgi/ /app/uwsgi/
+COPY ${SRC}/uwsgi/ /app/uwsgi/
 # %include version.json
-COPY topsrcdir/version.json /app/
+COPY ${SRC}/version.json /app/
 
 ENV PATH="/app/.venv/bin:${PATH}"