Add CI for aarch64 and FreeBSD

Author: giordano

.drone.jsonnet

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+local Pipeline(os, arch, version, alpine=false) = {
+    kind: "pipeline",
+    name: os+" - "+arch+" - Julia "+version+(if alpine then " (Alpine)" else ""),
+    platform: {
+        os: os,
+        arch: arch
+    },
+    steps: [
+        {
+            name: "Run tests",
+            image: "julia:"+version+(if alpine then "-alpine" else ""),
+            commands: [
+                "julia --project=. --check-bounds=yes --color=yes -e 'using InteractiveUtils; versioninfo(verbose=true)'",
+                "julia --project=. --check-bounds=yes --color=yes -e 'using Pkg; Pkg.instantiate()'",
+                "julia --project=. --check-bounds=yes --color=yes test/runtests.jl"
+            ]
+        }
+    ],
+    trigger: {
+        branch: ["master"]
+    }
+};
+
+[
+    Pipeline("linux", "arm64", "1.6"),
+]

.drone.yml

@@ -0,0 +1,21 @@
+---
+kind: pipeline
+name: linux - arm64 - Julia 1.6
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+- name: Run tests
+  image: julia:1.6
+  commands:
+  - "julia --project=. --check-bounds=yes --color=yes -e 'using InteractiveUtils; versioninfo(verbose=true)'"
+  - "julia --project=. --check-bounds=yes --color=yes -e 'using Pkg; Pkg.instantiate()'"
+  - julia --project=. --check-bounds=yes --color=yes test/runtests.jl
+
+trigger:
+  branch:
+  - master
+
+...

.travis.yml

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+language: julia
+os:
+  - freebsd
+julia:
+  - nightly
+matrix:
+  allow_failures:
+    - julia: nightly
+script:
+  - julia --project=. --check-bounds=yes --color=yes -e 'using InteractiveUtils; versioninfo(verbose=true)'
+  - julia --project=. --check-bounds=yes --color=yes -e 'using Pkg; Pkg.instantiate()'
+  - julia --project=. --check-bounds=yes --color=yes test/runtests.jl
+notifications:
+  email: false
+
+branches:
+  only:
+  - master
+  - gh-pages # For building documentation
+  - /^testing-.*$/ # testing branches
+  - /^v[0-9]+\.[0-9]+\.[0-9]+$/ # version tags