Update Docker workflows and Dockerfiles to enhance image metadata and support multiple branches

- Added support for the 'master' branch in the Docker workflow.
- Updated registry and image name in the workflow environment variables.
- Enhanced Dockerfile and Dockerfile.rootless with additional metadata labels including build date, version, and VCS reference.
- Updated action versions for improved compatibility and functionality.

docker/Dockerfile.rootless

@@ -1,10 +1,22 @@
 ARG PYTHON_VERSION=3.13
 FROM python:${PYTHON_VERSION}-alpine
 
-LABEL org.opencontainers.image.source="https://git.quad4.io/RNS-Things/rns-page-node"
-LABEL org.opencontainers.image.description="A simple way to serve pages and files over the Reticulum network."
-LABEL org.opencontainers.image.licenses="GPL-3.0"
-LABEL org.opencontainers.image.authors="Sudo-Ivan"
+ARG BUILD_DATE
+ARG VCS_REF
+ARG VERSION
+
+LABEL org.opencontainers.image.created=$BUILD_DATE \
+      org.opencontainers.image.title="RNS Page Node (Rootless)" \
+      org.opencontainers.image.description="A simple way to serve pages and files over the Reticulum network." \
+      org.opencontainers.image.url="https://git.quad4.io/RNS-Things/rns-page-node" \
+      org.opencontainers.image.documentation="https://git.quad4.io/RNS-Things/rns-page-node/src/branch/main/README.md" \
+      org.opencontainers.image.source="https://git.quad4.io/RNS-Things/rns-page-node" \
+      org.opencontainers.image.version=$VERSION \
+      org.opencontainers.image.revision=$VCS_REF \
+      org.opencontainers.image.vendor="RNS-Things" \
+      org.opencontainers.image.licenses="GPL-3.0" \
+      org.opencontainers.image.authors="Sudo-Ivan" \
+      org.opencontainers.image.base.name="python:${PYTHON_VERSION}-alpine"
 
 RUN addgroup -g 1000 app && adduser -D -u 1000 -G app app