chore: Automatically select self-hosted/github agents (#4514)

* Automatically select self-hosted/github agents in fork/main

* Update OS matrix to correctly take ARM self-hosted runners

* Change matrix to still use `arch` parameter

* Fix syntax

* Attempt at fixing hanging workflow

Refactor the 'runs-on' expression for better readability.

Author: oleg-kozlyuk-grafana

.github/workflows/backport.yml

@@ -12,7 +12,7 @@ jobs:
     # Also only run if the PR is merged, as an extra safe-guard.
     if: ${{ ! github.event.pull_request.head.repo.fork && github.event.pull_request.merged == true }}
 
-    runs-on: ubuntu-x64-small
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     permissions:
       contents: "read"
       id-token: "write"

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ concurrency:
 
 jobs:
   format:
-    runs-on: ubuntu-x64-large
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-large' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
@@ -31,7 +31,7 @@ jobs:
       - name: Format
         run: make fmt check/unstaged-changes
   check-generated:
-    runs-on: ubuntu-x64-large
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-large' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
@@ -48,7 +48,13 @@ jobs:
       fail-fast: false
       matrix:
         arch: [amd64, arm64]
-    runs-on: ubuntu-${{ matrix.arch }}-large
+    # Compute runner OS dynamically based on arch and repo ownership
+    runs-on: >-
+      ${{ 
+        github.repository_owner == 'grafana' 
+          && format('ubuntu-{0}-large', matrix.arch) 
+          || (matrix.arch == 'arm64' && 'ubuntu-24.04-arm' || 'ubuntu-24.04')
+      }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
@@ -63,7 +69,7 @@ jobs:
       - name: Test
         run: make go/test
   lint:
-    runs-on: ubuntu-x64-large
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-large' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
@@ -79,7 +85,7 @@ jobs:
         run: make helm/check check/unstaged-changes
 
   test-docs:
-    runs-on: ubuntu-x64-small
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     steps:
       - name: "Check out code"
         uses: "actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955" # v4
@@ -90,7 +96,7 @@ jobs:
 
   build-image:
     if: github.event_name != 'push'
-    runs-on: ubuntu-x64
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64' || 'ubuntu-latest' }}
     steps:
       - name: Checkout Repo
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
@@ -116,7 +122,7 @@ jobs:
     permissions:
       contents: read
       id-token: write
-    runs-on: ubuntu-x64-large
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-large' || 'ubuntu-latest' }}
     outputs:
       image: ${{ steps.push-metadata.outputs.image }}
       image-digest: ${{ steps.push-metadata.outputs.image-digest }}
@@ -163,7 +169,7 @@ jobs:
       contents: read
       id-token: write
     if: github.event_name == 'push' && github.repository == 'grafana/pyroscope' && github.ref == 'refs/heads/main'
-    runs-on: ubuntu-x64-small
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     needs: [build-push]
     steps:
     - id: "submit-argowfs-deployment"

.github/workflows/frontend.yml

@@ -14,7 +14,7 @@ permissions:
   contents: read
 jobs:
   type-check:
-    runs-on: ubuntu-x64
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
@@ -28,7 +28,7 @@ jobs:
       - name: Run type-check
         run: yarn type-check
   format:
-    runs-on: ubuntu-x64
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
@@ -42,7 +42,7 @@ jobs:
       - name: Run format
         run: yarn run format
   lint:
-    runs-on: ubuntu-x64
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
@@ -56,7 +56,7 @@ jobs:
       - name: Run lint
         run: yarn lint
   build:
-    runs-on: ubuntu-x64
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0

.github/workflows/fuzzer.yml

@@ -7,7 +7,7 @@ permissions:
   contents: read
 jobs:
   go-fuzz-merge-single:
-    runs-on: ubuntu-x64
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0

.github/workflows/renovate-config-validator.yml

@@ -18,7 +18,7 @@ permissions:
 
 jobs:
   validate:
-    runs-on: ubuntu-x64-small
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4

.github/workflows/test-examples.yml

@@ -13,7 +13,7 @@ permissions:
   contents: read
 jobs:
   test:
-    runs-on: ubuntu-x64-large
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-large' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0

.github/workflows/update-examples-cron.yml

@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   update-examples-cron:
-    runs-on: ubuntu-x64-small
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:

.github/workflows/update-make-docs.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   main:
     if: github.repository == 'grafana/pyroscope'
-    runs-on: ubuntu-x64-small
+    runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with: