feat: add auto-incrementing version number (0.9.0.X) in footer

- Added version.json to track base version and build number
- Updated Gitea Actions workflow to bump build number on each deploy
- Footer now shows version number alongside commit hash
- Version passed as build arg through Docker build pipeline

Co-Authored-By: Paperclip <noreply@paperclip.ing>

Dockerfile

@@ -8,7 +8,9 @@ RUN npm ci
 FROM base AS builder
 WORKDIR /app
 ARG COMMIT_HASH=dev
+ARG APP_VERSION=0.9.0.1
 ENV NEXT_PUBLIC_BUILD_HASH=$COMMIT_HASH
+ENV NEXT_PUBLIC_APP_VERSION=$APP_VERSION
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 RUN npm run build