update mapcache config, adding 15 max connections

config/dem_mapcache-dev.xml

 <mapcache>
+  <connection_pool>
+    <max_connections>15</max_connections>
+  </connection_pool>
   <default_format>mixed</default_format>
   <format name="mypng" type="PNG">
     <compression>fast</compression>

config/dem_mapcache-ops.xml

 <mapcache>
+  <connection_pool>
+    <max_connections>15</max_connections>
+  </connection_pool>
   <default_format>mixed</default_format>
   <format name="mypng" type="PNG">
     <compression>fast</compression>

config/emg_mapcache-dev.xml

 <mapcache>
+  <connection_pool>
+    <max_connections>15</max_connections>
+  </connection_pool>
   <default_format>mixed</default_format>
   <format name="mypng" type="PNG">
     <compression>fast</compression>
@@ -46,8 +49,14 @@
   <threaded_fetching>true</threaded_fetching>
 
   <!-- Cache -->
-  <cache name="emg" type="sqlite3">
-    <dbfile>/tmp/cache.db</dbfile>
+  <cache name="emg" type="swift">
+    <auth_url>{{OS_AUTH_URL_SHORT}}</auth_url>
+    <auth_version>{{ST_AUTH_VERSION}}</auth_version>
+    <tenant>{{OS_TENANT_ID}}</tenant>
+    <username>{{OS_USERNAME}}</username>
+    <password>{{OS_PASSWORD}}</password>
+    <container>{{BUCKET_NAME}}</container>
+    <key>{tileset}/{grid}/{dim:time}/{z}/{x}/{y}.{ext}</key>
   </cache>
 
   <!-- SOURCES Emergency -->

config/emg_mapcache-ops.xml

 <mapcache>
+  <connection_pool>
+    <max_connections>15</max_connections>
+  </connection_pool>
   <default_format>mixed</default_format>
   <format name="mypng" type="PNG">
     <compression>fast</compression>

config/vhr18_mapcache-dev.xml

 <mapcache>
+  <connection_pool>
+    <max_connections>15</max_connections>
+  </connection_pool>
   <default_format>mixed</default_format>
   <format name="mypng" type="PNG">
     <compression>fast</compression>

config/vhr18_mapcache-ops.xml

 <mapcache>
+  <connection_pool>
+    <max_connections>15</max_connections>
+  </connection_pool>
   <default_format>mixed</default_format>
   <format name="mypng" type="PNG">
     <compression>fast</compression>