Run actions on push to master, pull requests

[alamb]

Which issue does this PR close?

Re #2149

Rationale for this change

While wondering "why did we run out of github actions credits" (when my test jobs are waiting for a runner) I looked at the history of actions https://github.com/apache/arrow-rs/actions and saw several jobs were started twice

I have noticed the same thing on some of my own PRs but I have not found any recent examples.

What changes are included in this PR?

Change jobs to trigger on push to master only as well as PRs

Are there any user-facing changes?

No

[alamb]

this is an oversight -- and it means the object store test does not run against master (until this PR gets merged)

[alamb]

https://github.com/apache/arrow-rs/runs/7508735903?check_suite_focus=true

Its working!

[codecov-commenter]

Codecov Report

Merging #2166 (c77e0e1) into master (13e6f39) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2166   +/-   ##
=======================================
  Coverage   82.86%   82.86%           
=======================================
  Files         237      237           
  Lines       61429    61429           
=======================================
  Hits        50902    50902           
  Misses      10527    10527           

Impacted Files	Coverage Δ
parquet_derive/src/parquet_field.rs	65.98% <0.00%> (-0.23%)	⬇️
parquet/src/encodings/encoding.rs	93.43% <0.00%> (-0.20%)	⬇️
arrow/src/datatypes/datatype.rs	63.00% <0.00%> (+0.31%)	⬆️
...row/src/array/builder/string_dictionary_builder.rs	91.36% <0.00%> (+0.71%)	⬆️

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[ursabot]

Benchmark runs are scheduled for baseline = 13e6f39 and contender = ec3530d. ec3530d is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java