Build local containers for k8s services (#61)

## Summary
- Move devpi Dockerfile from argocd/manifests to containers/devpi/
- Add containers for: transmission, teslamate, miniflux, kiwix-serve, kubectl
- Update all k8s deployments to use local images (registry.ops.eblu.me/blumeops/*)
- All containers use v1.0.0 tag for initial release

## Containers Added
| Container | Source | Notes |
|-----------|--------|-------|
| devpi | python:3.12-slim | Existing, moved to containers/ |
| kubectl | alpine + download | For zim-watcher CronJob |
| miniflux | Go build from source | v2.2.16 |
| kiwix-serve | Download pre-built binary | v3.8.1 |
| transmission | alpine + apk install | Simpler than linuxserver image |
| teslamate | Elixir build from source | v2.2.0 |

## Deployment and Testing
- [ ] Build and tag devpi-v1.0.0
- [ ] Build and tag kubectl-v1.0.0
- [ ] Build and tag miniflux-v1.0.0
- [ ] Build and tag kiwix-serve-v1.0.0
- [ ] Build and tag transmission-v1.0.0
- [ ] Build and tag teslamate-v1.0.0
- [ ] Sync ArgoCD apps and verify services

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/61

containers/miniflux/Dockerfile

@@ -0,0 +1,31 @@
+# Miniflux RSS feed reader
+# Based on upstream packaging/docker/alpine/Dockerfile
+
+ARG MINIFLUX_VERSION=2.2.16
+
+FROM golang:alpine3.21 AS build
+
+ARG MINIFLUX_VERSION
+RUN apk add --no-cache build-base git make
+
+# Clone specific version
+RUN git clone --depth 1 --branch ${MINIFLUX_VERSION} \
+    https://github.com/miniflux/v2.git /go/src/app
+
+WORKDIR /go/src/app
+RUN make miniflux
+
+FROM alpine:3.21
+
+LABEL org.opencontainers.image.title=Miniflux
+LABEL org.opencontainers.image.description="Miniflux is a minimalist and opinionated feed reader"
+LABEL org.opencontainers.image.source=https://github.com/miniflux/v2
+
+EXPOSE 8080
+ENV LISTEN_ADDR=0.0.0.0:8080
+
+RUN apk --no-cache add ca-certificates tzdata
+COPY --from=build /go/src/app/miniflux /usr/bin/miniflux
+
+USER 65534
+CMD ["/usr/bin/miniflux"]