45615de26caa4c8ffeacc558143aaf6887cbb314 ci: Fix default retry script usage (Hennadii Stepanov)
Pull request description:
On master (5352d14b3796d9e672a20ada8f7613a70fe448f4) `CI_RETRY_EXE=${CI_RETRY_EXE:retry}` works as a [Substring Expansion](https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html), and that is wrong.
If `CI_RETRY_EXE` variable was unset initially, its new value becomes an empty string, but not "retry" as one could expect. Consequently, the `${CI_RETRY_EXE} ...` command does _not_ use `ci/retry/retry` script.
This PR makes for `CI_RETRY_EXE` variable a usual parameter expansion, i.e., `${parameter:-word}`.
Reference: https://github.com/bitcoin/bitcoin/pull/18735#issuecomment-620095489
Top commit has no ACKs.
Tree-SHA512: 108173f6b2677979b9ddf2f9b9df4a6c56f5efa81c36543a1816bb3b984e42984bf3c83fe413ea3a5ca1e2317c4efb02fea7180a6b44863af7cfe6202e9cf94d
da1f153e5e260f1744ee1bf4f24ca3a74ffea465 Add s390x tests to travis (Elichai Turkel)
2fa65e0de94f01d502e8ace89be3c5dc963dd764 Add ci script to install on s390x (Elichai Turkel)
Pull request description:
Discovered this as part of #17402 and a conversation with gmaxwell.
You can see here that the platform is indeed BE: https://travis-ci.org/elichai/bitcoin/jobs/616656410#L36
This closes https://github.com/bitcoin/bitcoin/issues/6466
ACKs for top commit:
MarcoFalke:
ACK da1f153e5e260f1744ee1bf4f24ca3a74ffea465
Tree-SHA512: e7e94e54e220257d91b24fddc79eab2bcaaadf0b2d1e7e6872d9757808ab2541728f00b1f3ab7e343305c0e7d91bb48a17a3f9621f6fff6c9fe6cde6682de408
