feat: tune visual of web app admin panel

Dockerfile

@@ -27,12 +27,22 @@ FROM python:3.12-slim
 
 WORKDIR /app
 
-LABEL org.opencontainers.image.source="https://github.com/3252a8/remnawave-minishop"
+ARG APP_VERSION=""
+ARG APP_REVISION=""
+
+LABEL org.opencontainers.image.source="https://github.com/3252a8/remnawave-minishop" \
+      org.opencontainers.image.version="${APP_VERSION}" \
+      org.opencontainers.image.revision="${APP_REVISION}"
 
 RUN useradd -u 10001 -m appuser
 
 COPY --from=python-builder /usr/local/lib/python3.12/site-packages /usr/local/lib/python3.12/site-packages
 
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+    --mount=type=cache,target=/var/lib/apt,sharing=locked \
+    apt-get update && \
+    apt-get install -y --no-install-recommends git
+
 COPY . .
 
 # Replace template assets with freshly built ones
@@ -46,7 +56,38 @@ COPY --from=webapp-builder /webapp/bot/app/web/templates/subscription_webapp.js
 COPY --from=webapp-builder /webapp/bot/app/web/templates/subscription_webapp.min.*.js \
                            bot/app/web/templates/
 
-RUN rm -rf /root/.cache
+RUN set -eux; \
+    if [ -n "$APP_VERSION" ]; then \
+      printf '%s\n' "$APP_VERSION" > .build-version; \
+    elif [ -d .git ]; then \
+      tag="$(git describe --tags --abbrev=0 2>/dev/null || true)"; \
+      sha="$(git rev-parse --short HEAD 2>/dev/null || true)"; \
+      dirty=""; \
+      if ! git diff --quiet --ignore-submodules HEAD 2>/dev/null; then dirty="-dirty"; fi; \
+      if [ -n "$tag" ] && [ -n "$sha" ]; then \
+        count="$(git rev-list "${tag}..HEAD" --count 2>/dev/null || true)"; \
+        if [ -n "$count" ] && [ "$count" != "0" ]; then \
+          printf '%s+%s.g%s%s\n' "$tag" "$count" "$sha" "$dirty" > .build-version; \
+        else \
+          printf '%s%s\n' "$tag" "$dirty" > .build-version; \
+        fi; \
+      elif [ -n "$sha" ]; then \
+        printf 'dev+g%s%s\n' "$sha" "$dirty" > .build-version; \
+      else \
+        printf 'dev+container\n' > .build-version; \
+      fi; \
+    else \
+      printf 'dev+container\n' > .build-version; \
+    fi; \
+    if [ -n "$APP_REVISION" ]; then \
+      printf '%s\n' "$APP_REVISION" > .build-revision; \
+    elif [ -d .git ]; then \
+      git rev-parse HEAD > .build-revision 2>/dev/null || printf 'unknown\n' > .build-revision; \
+    else \
+      printf 'unknown\n' > .build-revision; \
+    fi; \
+    apt-get purge -y --auto-remove git; \
+    rm -rf .git /root/.cache
 
 RUN mkdir -p /app/logs /app/data && chown -R appuser:appuser /app/logs /app/data