Add commits to configuration to deploy :latest tag

The recommended way to update a kubernetes deployment to a new image is
to change the image tag. However, our build server is configured to push
every commit of the `master` branch to docker hub to the respective
repository and tag `:latest`. So adding some configuration that can be
changed seems to be a trick to re-deploy the `:latest` image.

See here:
https://stackoverflow.com/a/51835397

deployments/backend.yml

@@ -18,6 +18,8 @@ spec:
     spec:
       containers:
       - env:
+        - name: COMMIT
+          value: <BACKEND_COMMIT>
         - name: MOCK
           value: "false"
         - name: CLIENT_URI

deployments/db-migration-worker.yml

@@ -19,6 +19,8 @@
       spec:
         containers:
         - env:
+          - name: COMMIT
+            value: <BACKEND_COMMIT>
           - name: SSH_USERNAME
             valueFrom:
               configMapKeyRef:
@@ -64,7 +66,6 @@
               name: ssh-keys-directory
             - mountPath: /mongo-export/
               name: mongo-export
-        restartPolicy: Always
         volumes:
         - name: ssh-keys-directory
           persistentVolumeClaim:
@@ -72,6 +73,7 @@
         - name: mongo-export
           persistentVolumeClaim:
             claimName: mongo-export-claim
+        restartPolicy: Always
         terminationGracePeriodSeconds: 30
   status: {}
 ---

deployments/neo4j.yml

@@ -18,6 +18,8 @@
       spec:
         containers:
         - env:
+          - name: COMMIT
+            value: <BACKEND_COMMIT>
           - name: NEO4J_apoc_import_file_enabled
             value: "true"
           - name: NEO4J_dbms_memory_pagecache_size
@@ -47,13 +49,12 @@
           - containerPort: 7687
           - containerPort: 7474
           resources: {}
-          imagePullPolicy: IfNotPresent
+          imagePullPolicy: Always
           volumeMounts:
             - mountPath: /data/
               name: neo4j-data
             - mountPath: /mongo-export/
               name: mongo-export
-        restartPolicy: Always
         volumes:
         - name: mongo-export
           persistentVolumeClaim:
@@ -61,6 +62,8 @@
         - name: neo4j-data
           persistentVolumeClaim:
             claimName: neo4j-data-claim
+        restartPolicy: Always
+        terminationGracePeriodSeconds: 30
   status: {}
 ---
   apiVersion: v1

deployments/web.yml

@@ -18,6 +18,8 @@ spec:
     spec:
       containers:
       - env:
+        - name: COMMIT
+          value: <WEBAPP_COMMIT>
         - name: HOST
           value: 0.0.0.0
         - name: BACKEND_URL