Skip publish action for pull requests

.github/workflows/ci.yaml

@@ -10,6 +10,7 @@ on:
 
 jobs:
   hlint:
+    if: true
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -26,6 +27,7 @@ jobs:
           fail-on: warning
 
   fourmolu:
+    if: true
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -35,6 +37,7 @@ jobs:
           version: "0.16.2.0"
 
   cabal:
+    if: true
     name: cabal ${{ matrix.cabal }} / ghc ${{ matrix.ghc }}
     runs-on: ${{ matrix.os }}
     strategy:
@@ -56,6 +59,7 @@ jobs:
           cabal-version: ${{ matrix.cabal }}
 
   stack:
+    if: true
     name: stack ${{ matrix.stack }} / ${{ matrix.resolver }}
     runs-on: ${{ matrix.os }}
     strategy:
@@ -76,6 +80,7 @@ jobs:
           stack-version: ${{ matrix.stack }}
 
   publish:
+    if: github.event_name != "pull_request"
     name: "publish"
     runs-on: "ubuntu-latest"
     needs: