chore: cleanup and nixify

* create containers with nix
* updated README.md
* added SPDX license headers

Signed-off-by: Harald Hoyer <harald@matterlabs.dev>

packages/container-vault-sgx-azure/Dockerfile

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2024 Matter Labs
+
+FROM teepot-vault-sgx-azure:base
+
+WORKDIR /opt/vault
+
+COPY packages/container-vault-sgx-azure/test-enclave-key.pem /tmp/
+RUN set -eux; \
+    gramine-manifest \
+      -Dtee_ratls_preexec=$(readlink /bin/tee-ratls-preexec) \
+      -Dvault_exec=$(readlink /bin/vault) \
+      -Darch_libdir=/lib/x86_64-linux-gnu \
+      -Dexecdir=/bin \
+      -Dlog_level=warning \
+      vault.manifest.toml vault.manifest; \
+    gramine-sgx-sign --manifest vault.manifest --output vault.manifest.sgx --key /tmp/test-enclave-key.pem; \
+    rm /tmp/test-enclave-key.pem
+
+VOLUME /opt/vault/tls
+VOLUME /opt/vault/data
+
+ENTRYPOINT ["/bin/sh", "-c"]
+ENV SSL_CERT_FILE=/etc/ssl/certs/ca-bundle.crt
+CMD [ "echo vault in SGX mode starting; restart-aesmd ; exec gramine-sgx vault" ]