fix(docker): fix Docker image latest tag and production runtime errors; add dev compose file, Codespace support, and semver release tagging (#7) (#4277)

* fix: also tag Docker image as latest on main branch push

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* fix: production Dockerfile missing patches/.env.web; add compose.dev.yaml for dev hot-reload

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* fix: add devcontainer to init submodules; add clear Dockerfile error when submodules missing

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* simplify production-stage: COPY --from=build /app /app instead of selective copies

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* fix: add CI=true to dev compose to prevent pnpm no-TTY abort

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* fix: add semver Docker image version tags on release

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---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>

.devcontainer/devcontainer.json

@@ -0,0 +1,6 @@
+{
+  "name": "Readest",
+  // Initialize only the submodules required for Docker builds.
+  // tauri/tauri-plugins are skipped here since they're only needed for desktop builds.
+  "postCreateCommand": "git submodule update --init packages/foliate-js packages/simplecc-wasm"
+}