Add Gitea Actions workflow and platform/deploy doc updates

- Add .gitea/workflows/docker-build-push.yaml: build api/admin/upload on push to main
- Build script: build for linux/amd64 by default (PLATFORM), doc PLATFORM=linux/arm64
- Deploy README: Option A Gitea Actions, Option B manual; proxy timeout troubleshooting

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/docker-build-push.sh

@@ -3,6 +3,7 @@
 # One-time: docker login 10.0.10.205:3000 (username: bert.hausmans, password: token or password).
 # Usage: ./scripts/docker-build-push.sh [VERSION]
 #   VERSION defaults to "latest" (or git describe --tags --always if available).
+#   Set PLATFORM=linux/arm64 if your Dockge server is ARM (e.g. Raspberry Pi).
 # Run from project root.
 
 set -e
@@ -18,12 +19,14 @@ else
   VERSION=$(git describe --tags --always 2>/dev/null || echo "latest")
 fi
 
-echo "Building and pushing images with tag: $VERSION"
+# Build for linux/amd64 so images run on typical Dockge servers (avoid "no matching manifest" on ARM-built images)
+PLATFORM="${PLATFORM:-linux/amd64}"
+echo "Building and pushing images with tag: $VERSION (platform: $PLATFORM)"
 echo "Registry: $REGISTRY, Owner: $OWNER"
 echo ""
 
 for name in api admin upload; do
-  docker build -t "$REGISTRY/$OWNER/event-uploader-$name:$VERSION" "$ROOT/$name"
+  docker build --platform "$PLATFORM" -t "$REGISTRY/$OWNER/event-uploader-$name:$VERSION" "$ROOT/$name"
   docker push "$REGISTRY/$OWNER/event-uploader-$name:$VERSION"
   if [ "$VERSION" != "latest" ]; then
     docker tag "$REGISTRY/$OWNER/event-uploader-$name:$VERSION" "$REGISTRY/$OWNER/event-uploader-$name:latest"