Add template pm2 ecosystem files

ecosystem.config.dev-template.js

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+// Template for local development pm2 ecosystem file
+
+// Copy this file and edit to set up pm2 config
+// DO NOT COMMIT details to this file (publicly visible)
+// See https://pm2.io/doc/en/runtime/guide/ecosystem-file/ for docs
+module.exports = {
+    apps : [
+        {
+            name: "app",
+            cwd: "./app",
+            script: "npm",
+            args: "start",
+            env: {
+                NODE_ENV: "development",
+                TILECACHE_PATH: "./app/tilecache"
+
+                // update these details in private copy
+                PGHOST: "hostname",
+                PGPORT: 5432,
+                PGDATABASE: "databasename",
+                PGUSER: "username",
+                PGPASSWORD: "longrandomsecret",
+                APP_COOKIE_SECRET: "longrandomsecret",
+
+            }
+        }
+    ]
+  }

ecosystem.config.template.js

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+// Template for production ecosystem file
+
+// Copy this file and edit to set up pm2 config
+// DO NOT COMMIT details to this file (publicly visible)
+// See https://pm2.io/doc/en/runtime/guide/ecosystem-file/ for docs
+module.exports = {
+    apps: [
+        {
+            name: "colouringlondon",
+            script: "./app/build/server.js",
+            instances: 2,
+            env: {
+                NODE_ENV: "production",
+                PGHOST: "hostname",
+                PGPORT: 5432,
+                PGDATABASE: "databasename",
+                PGUSER: "username",
+                PGPASSWORD: "longrandomsecret",
+                APP_COOKIE_SECRET: "longrandomsecret",
+                TILECACHE_PATH: "/path/to/tile/cache"
+            }
+        }
+    ]
+}