COPY zitadel /app/zitadel Zitadel folder not available while building through build/dockerfile

Fix first: dont build the Dockerfile directly. Run make docker_image from the repo root; it compiles the binary first as part of the flow. Maintainer-confirmed.

COPY zitadel /app/zitadel -> Zitadel folder not available

1. From the repo root, run make docker_image.
2. Expected: the binary is compiled, the COPY step finds it, and the image builds.

When to use: building Zitadel through build/dockerfile fails because the COPY zitadel step cannot find the binary.

When not to use: other Docker build failures (missing base images, network issues); those are different problems.

Compatibility: zitadel repo, build/dockerfile. Reported in zitadel/zitadel#6277.

Variants:

• "zitadel folder not available docker build"
• "COPY zitadel /app/zitadel fails"
• "zitadel make docker_image"

Root cause: the Dockerfile expects a prebuilt zitadel binary in the build context. Building the Dockerfile directly skips the compile step, so there is nothing to copy.

Edge cases: if make docker_image itself fails, fix the compile error first. The Dockerfile was never meant to be built standalone.