Build History for branch/live

Merge pull request #240 from ocaml-opam/rjbou-update-key Update opam dev team public key

Merge pull request #238 from mtelvers/dockerfile Dockerfile maintenance updates

Merge pull request #237 from mtelvers/opam-solver-timeout

Merge pull request #233 from dra27/revert-231 Revert #231

Merge pull request #232 from rjbou/key Update public key

Merge pull request #231 from dra27/hotfix-ocamlgraph Hotfix unavailability of ocamlgraph.1.8.8 sources

Merge pull request #230 from ocaml-opam/speedup-cache-checksum Speedup the cache checksum by using opam master instead of opam 2.0