ARROW-8309: [CI] C++/Java/Rust workflows should trigger on changes to…

… Flight.proto

This also narrows the scope of the triggers on changes to the `ci/` directory (cc @kszucs )

Closes #6801 from nealrichardson/flight-ci

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>

.github/workflows/cpp.yml

@@ -23,11 +23,13 @@ on:
       - '.github/workflows/cpp.yml'
       - 'ci/**'
       - 'cpp/**'
+      - 'format/Flight.proto'
   pull_request:
     paths:
       - '.github/workflows/cpp.yml'
       - 'ci/**'
       - 'cpp/**'
+      - 'format/Flight.proto'
 
 env:
   ARROW_ENABLE_TIMING_TESTS: OFF

.github/workflows/java.yml

@@ -21,12 +21,18 @@ on:
   push:
     paths:
       - '.github/workflows/java.yml'
-      - 'ci/**'
+      - 'ci/docker/*java*'
+      - 'ci/scripts/java*.sh'
+      - 'ci/scripts/util_*.sh'
+      - 'format/Flight.proto'
       - 'java/**'
   pull_request:
     paths:
       - '.github/workflows/java.yml'
-      - 'ci/**'
+      - 'ci/docker/*java*'
+      - 'ci/scripts/java*.sh'
+      - 'ci/scripts/util_*.sh'
+      - 'format/Flight.proto'
       - 'java/**'
 
 jobs:

.github/workflows/rust.yml

@@ -21,13 +21,19 @@ on:
   push:
     paths:
       - '.github/workflows/rust.yml'
-      - 'ci/**'
+      - 'ci/docker/*rust*'
+      - 'ci/scripts/rust_*.sh'
+      - 'ci/scripts/util_*.sh'
       - 'rust/**'
+      - 'format/Flight.proto'
   pull_request:
     paths:
       - '.github/workflows/rust.yml'
-      - 'ci/**'
+      - 'ci/docker/*rust*'
+      - 'ci/scripts/rust_*.sh'
+      - 'ci/scripts/util_*.sh'
       - 'rust/**'
+      - 'format/Flight.proto'
 
 jobs: