dev/sg: add 'sg run server' alias (#38256)

Convenient for running end-to-end tests the same way we run them in CI.

dev/run-server-image.sh

@@ -2,7 +2,8 @@
 # This runs a published or local server image for testing and development purposes.
 
 IMAGE=${IMAGE:-sourcegraph/server:${TAG:-insiders}}
-URL=${URL:-"http://localhost:7080"}
+PORT=${PORT:-"7080"}
+URL="http://localhost:$PORT"
 DATA=${DATA:-"/tmp/sourcegraph-data"}
 
 echo "--- Checking for existing Sourcegraph instance at $URL"
@@ -31,9 +32,9 @@ if [ "$clean" != "n" ] && [ "$clean" != "N" ]; then
   rm -rf "$DATA"
 fi
 
-echo "--- Starting server ${IMAGE}"
+echo "--- Starting server ${IMAGE} on port ${PORT}"
 docker run "$@" \
-  --publish 7080:7080 \
+  --publish "$PORT":7080 \
   -e SRC_LOG_LEVEL=dbug \
   -e DEBUG=t \
   --volume "$DATA/config:/etc/sourcegraph" \

doc/dev/background-information/sg/reference.md

@@ -108,6 +108,7 @@ Available commands in `sg.config.yaml`:
 * redis-postgres
 * repo-updater
 * searcher
+* server
 * storybook
 * symbols
 * syntax-highlighter

sg.config.yaml

@@ -115,6 +115,14 @@ env:
   ENABLE_STREAMING_REPOS_SYNCER: true
 
 commands:
+  server:
+    cmd: ./dev/run-server-image.sh
+    env:
+      TAG: insiders
+      CLEAN: 'true'
+      DATA: '/tmp/sourcegraph-data'
+      URL: 'http://localhost:7080'
+
   oss-frontend:
     cmd: .bin/oss-frontend
     install: |
@@ -964,7 +972,10 @@ tests:
 
   frontend-e2e:
     preamble: |
-      'sg start enterprise-e2e' must be already running for these tests to work.
+      'sg start enterprise-e2e' must be already running for these tests to work. You can also
+      run tests against an existing server image:
+
+        TAG=insiders sg run server
 
       If you run into authentication issues, you can run the following commands to fix them: