ci: install GitHub CLI for distro validation

- Install GitHub CLI from Ubuntu repositories in every trusted job that invokes gh api.
- Restore kernel context resolution, validation dispatch, failure reporting, callback validation, and Check Run updates.
- Remove reliance on the ephemeral runner image providing the GitHub CLI.

Signed-off-by: Bjordis Collaku <bcollaku@qti.qualcomm.com>

Author: bjordiscollaku

.github/workflows/premerge-distro-validation.yml

@@ -51,6 +51,12 @@ jobs:
         with:
           persist-credentials: false
 
+      - name: Install GitHub CLI
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends gh
+
       - id: context
         name: Validate triggering workflow context
         env:
@@ -74,6 +80,12 @@ jobs:
         with:
           persist-credentials: false
 
+      - name: Install GitHub CLI
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends gh
+
       - id: check
         name: Start distro validation Check Run
         env:
@@ -134,6 +146,12 @@ jobs:
         with:
           persist-credentials: false
 
+      - name: Install GitHub CLI
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends gh
+
       - name: Publish failure status
         env:
           GH_TOKEN: ${{ github.token }}
@@ -168,6 +186,12 @@ jobs:
         with:
           persist-credentials: false
 
+      - name: Install GitHub CLI
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends gh
+
       - id: callback
         name: Validate returned distro result
         env:
@@ -192,6 +216,12 @@ jobs:
         with:
           persist-credentials: false
 
+      - name: Install GitHub CLI
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends gh
+
       - name: Publish final status and summary
         env:
           GH_TOKEN: ${{ github.token }}