[demo] Add global image registry (#7620)

## Which problem is this PR solving?
- Added global image registry to fix the imageInspectError on running
deploy-all.sh in upgarde mode by ci
<img width="1327" height="365" alt="image"
src="https://github.com/user-attachments/assets/c01ac5dc-7bb2-4935-ab76-7e3e288f4c82"
/>


## Description of the changes
- 

## How was this change tested?
- manually running the deploy-all.sh script in both upgrade and clean
mode

## Checklist
- [ ] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [ ] I have signed all commits
- [ ] I have added unit tests for the new functionality
- [ ] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `npm run lint` and `npm run test`

---------

Signed-off-by: danish9039 <[email protected]>

Author: danish9039

examples/oci/deploy-all.sh

@@ -75,6 +75,7 @@ if [[ "$MODE" == "local" ]]; then
     --set allInOne.enabled=true \
     --set storage.type=memory \
     --set hotrod.enabled=true \
+    --set global.imageRegistry="" \
     --set allInOne.image.repository="localhost:5000/jaegertracing/jaeger" \
     --set allInOne.image.tag="${IMAGE_TAG}"  \
     --set allInOne.image.pullPolicy="Never" \
@@ -90,7 +91,7 @@ else
     --set provisionDataStore.cassandra=false \
     --set allInOne.enabled=true \
     --set storage.type=memory \
-    --set allInOne.image.repository="docker.io/jaegertracing/jaeger" \
+    --set allInOne.image.repository="jaegertracing/jaeger" \
     --set-file userconfig="./config.yaml" \
     --set-file uiconfig="./ui-config.json" \
     -f ./jaeger-values.yaml

examples/oci/jaeger-values.yaml

@@ -1,7 +1,9 @@
+global:
+  imageRegistry: docker.io
 hotrod:
   enabled: true
   image:
-    repository: docker.io/jaegertracing/example-hotrod
+    repository: jaegertracing/example-hotrod
     tag: "1.72.0"
   args:
     - all