latexgrambot: inline LaTeX bot for Telegram in Go

Renders LaTeX expressions into PNG pictures, PDF documents and native
Telegram rich text messages, entirely locally with TeX Live and poppler.

- Chat mode with /image, /pdf, /rich plus per-user preamble and DPI
- Inline mode delivering picture, PDF and rich text results
- Broad default package set preloaded into a TeX format at image build
- MongoDB persistence: settings, users, groups, render statistics
- Private S3-compatible bucket with short-lived presigned URLs
- OpenTelemetry traces over OTLP
- Kubernetes manifests and Argo CD application, Docker Compose, GitHub
  Actions CI, BSD 3-Clause license

argocd-application.yaml

@@ -0,0 +1,41 @@
+# Optional: GitOps deployment with Argo CD. Point repoURL at your fork,
+# adjust the project and the destination namespace.
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: latexgrambot
+  namespace: argocd
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+
+  source:
+    repoURL: https://github.com/your-org/latexgrambot.git
+    targetRevision: main
+    path: k8s
+    directory:
+      recurse: false
+      # secret.example.yaml is intentionally excluded: the Telegram token
+      # and the S3 credentials are applied manually and must never reach
+      # the repository.
+      include: '{configmap.yaml,deployment.yaml,service.yaml}'
+
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: latexgrambot
+
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+      allowEmpty: false
+    syncOptions:
+      - CreateNamespace=true
+      - ServerSideApply=true
+    retry:
+      limit: 5
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 3m