updated .dockerignore to make it easier to add additional backends

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/fresh-panthers-arrive.md

@@ -0,0 +1,18 @@
+---
+'@backstage/create-app': patch
+---
+
+Tweaked the `.dockerignore` file so that it's easier to add additional backend packages if desired.
+
+To apply this change to an existing app, make the following change to `.dockerignore`:
+
+```diff
+ cypress
+ microsite
+ node_modules
+-packages
+-!packages/backend/dist
++packages/*/src
++packages/*/node_modules
+ plugins
+```

.dockerignore

@@ -3,6 +3,6 @@ docs
 cypress
 microsite
 node_modules
-packages
-!packages/backend/dist
+packages/*/src
+packages/*/node_modules
 plugins

docs/deployment/docker.md

@@ -96,8 +96,8 @@ root of the repo to speed up the build by reducing build context size:
 ```text
 .git
 node_modules
-packages
-!packages/backend/dist
+packages/*/src
+packages/*/node_modules
 plugins
 ```
 

packages/create-app/templates/default-app/.dockerignore

@@ -1,6 +1,6 @@
 .git
 node_modules
-packages
-!packages/backend/dist
+packages/*/src
+packages/*/node_modules
 plugins
 *.local.yaml