Make workflows run if it's being run in public repo, or it was trigge…

…red by pull request.

.github/workflows/codegen.yml

@@ -1,11 +1,14 @@
 name: Codegen
 
 on:
+  push:
+    branches: [ main ]
   pull_request:
   workflow_dispatch:
 
 jobs:
   codegen:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ${{ matrix.os }}
     name: Java ${{ matrix.java }} ${{ matrix.os }}
     strategy:

.github/workflows/continuous-integration.yml

@@ -1,6 +1,8 @@
 name: CI
 
 on:
+  push:
+    branches: [ main ]
   pull_request:
   workflow_dispatch:
 
@@ -9,6 +11,7 @@ env:
 
 jobs:
   apple-ci:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ${{ matrix.runner }}
     strategy:
       fail-fast: false
@@ -101,6 +104,7 @@ jobs:
             | xcbeautify
 
   apple-downstream:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ${{ matrix.runner }}
     strategy:
       fail-fast: false
@@ -221,6 +225,7 @@ jobs:
             | xcbeautify
 
   linux-ci:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -273,6 +278,7 @@ jobs:
         run: swift test
 
   linux-downstream:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false

.github/workflows/lint.yml

@@ -1,11 +1,14 @@
 name: Lint
 
 on:
+  push:
+    branches: [ main ]
   pull_request:
   workflow_dispatch:
 
 jobs:
   ktlint:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
@@ -14,6 +17,7 @@ jobs:
         run: ./gradlew ktlint
 
   swiftlint:
+    if: github.repository == 'smithy-lang/smithy-swift' || github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/realm/swiftlint:0.54.0