Add build for presence service.

.github/workflows/build.yaml

@@ -11,6 +11,7 @@ env:
   ENQUEUE_NAME: embargo-butler-enqueue
   INGEST_NAME: embargo-butler-ingest
   IDLE_NAME: embargo-butler-idle
+  PRESENCE_NAME: embargo-butler-presence
 
 jobs:
   push:
@@ -20,7 +21,7 @@ jobs:
       contents: read
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Build enqueue image
       run: |
@@ -43,6 +44,13 @@ jobs:
           --tag $IDLE_NAME \
           --label "runnumber=${GITHUB_RUN_ID}"
 
+    - name: Build presence image
+      run: |
+        docker build . \
+          -f Dockerfile.presence \
+          --tag $PRESENCE_NAME \
+          --label "runnumber=${GITHUB_RUN_ID}"
+
     - name: Log in to GitHub Container Registry
       run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u $ --password-stdin
 
@@ -51,6 +59,7 @@ jobs:
         ENQUEUE_ID=ghcr.io/${{ github.repository_owner }}/$ENQUEUE_NAME
         INGEST_ID=ghcr.io/${{ github.repository_owner }}/$INGEST_NAME
         IDLE_ID=ghcr.io/${{ github.repository_owner }}/$IDLE_NAME
+        PRESENCE_ID=ghcr.io/${{ github.repository_owner }}/$PRESENCE_NAME
 
         if [[ "${{ github.ref }}" == "refs/pull/"* ]]; then
           VERSION=$(echo "${{ github.head_ref }}" | sed -e 's|.*/||')
@@ -62,10 +71,13 @@ jobs:
         echo ENQUEUE_ID=$ENQUEUE_ID
         echo INGEST_ID=$INGEST_ID
         echo IDLE_ID=$IDLE_ID
+        echo PRESENCE_ID=$PRESENCE_ID
         echo VERSION=$VERSION
         docker tag $ENQUEUE_NAME $ENQUEUE_ID:$VERSION
         docker push $ENQUEUE_ID:$VERSION
         docker tag $INGEST_NAME $INGEST_ID:$VERSION
         docker push $INGEST_ID:$VERSION
         docker tag $IDLE_NAME $IDLE_ID:$VERSION
         docker push $IDLE_ID:$VERSION
+        docker tag $PRESENCE_NAME $PRESENCE_ID:$VERSION
+        docker push $PRESENCE_ID:$VERSION

Dockerfile.presence

@@ -0,0 +1,32 @@
+# This file is part of embargo_butler.
+#
+# Developed for the LSST Data Management System.
+# This product includes software developed by the LSST Project
+# (http://www.lsst.org).
+# See the COPYRIGHT file at the top-level directory of this distribution
+# for details of code ownership.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Dockerfile for presence service.
+
+FROM python:3.11
+RUN pip install redis gunicorn flask
+WORKDIR /presence
+COPY src/presence.py src/utils.py /presence/
+# environment variables that must be set:
+# REDIS_HOST REDIS_PASSWORD
+# optional:
+# DELETE_SEEN
+ENTRYPOINT [ "gunicorn", "-b", "0.0.0.0:8000", "-w", "2", "presence:app" ]