chore: pin GitHub Actions to SHA for supply chain security

Pin all external GitHub Actions to specific commit SHAs to prevent
supply chain attacks via malicious tag updates.

Actions pinned:
- actions/cache@v4
- actions/checkout@v5
- actions-ecosystem/action-add-labels@v1
- actions/setup-node@v5
- cschleiden/actions-linter@v1
- google-github-actions/auth@v3.0.0
- google-github-actions/setup-gcloud@v3.0.1
- slackapi/slack-github-action@v2.1.1

Exceptions (internal Gitpod workflows, not pinned):
- gitpod-io/gce-github-runner/.github/workflows/create-vm.yml@main
- gitpod-io/gce-github-runner/.github/workflows/delete-vm.yml@main

Part of PDE-138
Closes PDE-218

Co-authored-by: Ona <no-reply@ona.com>

Author: corneliusludmann

.github/workflows/autofix.yml

@@ -9,10 +9,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # pin@v5
 
     - name: Setup Node
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # pin@v5
       with:
         node-version: "22.x"
 

.github/workflows/dockerhub-release.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout workspace-images
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # pin@v5
         with:
           repository: gitpod-io/workspace-images
 
@@ -61,13 +61,13 @@ jobs:
           echo "{}" > $SKOPEO_AUTH_DIR/auth
 
       - name: ☁️ Set up Cloud SDK
-        uses: google-github-actions/setup-gcloud@v3.0.1
+        uses: google-github-actions/setup-gcloud@aa5489c8933f4cc7a4f7d45035b3b1440c9c10db # pin@v3.0.1
         with:
           version: 393.0.0
 
       - name: 🔐 Authenticate to Google Cloud
         id: "auth"
-        uses: google-github-actions/auth@v3.0.0
+        uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # pin@v3.0.0
         with:
           token_format: "access_token"
           workload_identity_provider: ${{env.WORKLOAD_IDENTITY_POOL_ID}}
@@ -106,7 +106,7 @@ jobs:
       - name: The release was successful
         id: slack-success
         if: needs.promote-latest.result == 'success'
-        uses: slackapi/slack-github-action@v2.1.1
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # pin@v2.1.1
         with:
           webhook-type: incoming-webhook
           webhook: ${{ secrets.RELEASE_NOTIFY_WEBHOOK }}
@@ -116,7 +116,7 @@ jobs:
       - name: The release was not successful
         id: slack-failure
         if: needs.promote-latest.result != 'success'
-        uses: slackapi/slack-github-action@v2.1.1
+        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # pin@v2.1.1
         with:
           webhook-type: incoming-webhook
           webhook: ${{ secrets.RELEASE_NOTIFY_WEBHOOK }}

.github/workflows/lint.yml

@@ -9,7 +9,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
-      - uses: cschleiden/actions-linter@v1
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # pin@v5
+      - uses: cschleiden/actions-linter@1282bc2497ca41be7846b12393d54945a7d63267 # pin@v1
         with:
           workflows: '[".github/workflows/*.yaml"]'

.github/workflows/pull-request.yml

@@ -23,7 +23,7 @@ jobs:
       BUILDKIT_VERSION: 0.12.3
     steps:
       - name: 📥 Checkout workspace-images
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # pin@v5
         with:
           repository: gitpod-io/workspace-images
 
@@ -52,13 +52,13 @@ jobs:
       # A hack as GH action does not allow you to force override cache storing if there was a cache hit
       # https://github.com/actions/cache/issues/628#issuecomment-986118455
       - name: 🗄️ Force Save Registry Cache Per Sha
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # pin@v4
         with:
           path: ~/registry
           key: ${{ runner.os }}-pull-request-cache-${{ github.sha }}
 
       - name: 🗄️ Restore Registry Cache
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # pin@v4
         with:
           path: ~/registry
           key: ${{ runner.os }}-pull-request-cache-${{ github.sha }}

.github/workflows/push-main.yml

@@ -42,7 +42,7 @@ jobs:
 
     steps:
       - name: 📥 Checkout workspace-images
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # pin@v5
         with:
           repository: gitpod-io/workspace-images
 
@@ -114,13 +114,13 @@ jobs:
           sudo chmod +777 /run/buildkit/buildkitd.sock
 
       - name: ☁️ Set up Cloud SDK
-        uses: google-github-actions/setup-gcloud@v3.0.1
+        uses: google-github-actions/setup-gcloud@aa5489c8933f4cc7a4f7d45035b3b1440c9c10db # pin@v3.0.1
         with:
           version: 393.0.0
 
       - name: 🔐 Authenticate to Google Cloud
         id: "auth"
-        uses: google-github-actions/auth@v3.0.0
+        uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # pin@v3.0.0
         with:
           token_format: "access_token"
           access_token_lifetime: "43200s"

.github/workflows/triage.yml

@@ -7,9 +7,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # pin@v5
 
       - name: add label
-        uses: actions-ecosystem/action-add-labels@v1
+        uses: actions-ecosystem/action-add-labels@18f1af5e3544586314bbe15c0273249c770b2daf # pin@v1
         with:
           labels: "team: team-experience"