Run certain GitHub Actions workflows on official repo only

Don't run specific GitHub Actions workflows from forks. Specifically: benchmarks.yml, check-links.yml, ci_docs.yml, ci_doctests.yaml, ci_tests_legacy.yaml, and release_drafter.yml.

.github/workflows/benchmarks.yml

@@ -32,6 +32,7 @@ concurrency:
 jobs:
   benchmarks:
     runs-on: ubuntu-22.04
+    if: github.repository == 'GenericMappingTools/pygmt'
     defaults:
       run:
         shell: bash -l {0}

.github/workflows/check-links.yml

@@ -18,6 +18,7 @@ jobs:
   check_links:
     name: Check Links
     runs-on: ubuntu-latest
+    if: github.repository == 'GenericMappingTools/pygmt'
 
     steps:
     - name: Checkout the repository

.github/workflows/ci_docs.yml

@@ -37,6 +37,7 @@ jobs:
   docs:
     name: ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
+    if: github.repository == 'GenericMappingTools/pygmt'
     strategy:
       fail-fast: false
       matrix:

.github/workflows/ci_doctests.yaml

@@ -21,6 +21,7 @@ jobs:
   test:
     name: ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
+    if: github.repository == 'GenericMappingTools/pygmt'
     strategy:
       fail-fast: false
       matrix:

.github/workflows/ci_tests_legacy.yaml

@@ -32,6 +32,7 @@ jobs:
   test:
     name: ${{ matrix.os }} - GMT ${{ matrix.gmt_version }}
     runs-on: ${{ matrix.os }}
+    if: github.repository == 'GenericMappingTools/pygmt'
     strategy:
       fail-fast: false
       matrix:

.github/workflows/release-drafter.yml

@@ -15,6 +15,8 @@ on:
 jobs:
   update_release_draft:
     runs-on: ubuntu-latest
+    if: github.repository == 'GenericMappingTools/pygmt'
+
     steps:
       # Drafts your next Release notes as Pull Requests are merged into "main"
       - uses: release-drafter/[email protected]