ci: add Docker manifests for Osiris

Signed-off-by: Xe Iaso <me@xeiaso.net>

docker/osiris.Dockerfile

@@ -0,0 +1,29 @@
+ARG ALPINE_VERSION=edge
+FROM --platform=${BUILDPLATFORM} alpine:${ALPINE_VERSION} AS build
+
+ARG TARGETOS
+ARG TARGETARCH
+ARG VERSION=devel-docker
+
+RUN apk -U add go nodejs git build-base git npm bash zstd brotli gzip
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN --mount=type=cache,target=/root/.cache npm ci && npm run assets
+RUN --mount=type=cache,target=/root/.cache GOOS=${TARGETOS} GOARCH=${TARGETARCH} CGO_ENABLED=0 GOARM=7 go build -gcflags "all=-N -l" -o /app/bin/osiris -ldflags "-s -w -extldflags -static -X github.com/TecharoHQ/anubis.Version=${VERSION}" ./cmd/osiris
+
+FROM alpine:${ALPINE_VERSION} AS run
+WORKDIR /app
+
+RUN apk -U add ca-certificates mailcap
+
+COPY --from=build /app/bin/osiris /app/bin/osiris
+
+CMD ["/app/bin/anubis"]
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 CMD [ "/app/bin/anubis", "--healthcheck" ]
+
+LABEL org.opencontainers.image.source="https://github.com/TecharoHQ/anubis"