chore: pin GitHub Actions and Docker base images to full-length hashes (OSSF scorecard) (#2658)

* Initial plan

* chore: pin GitHub Actions dependencies to specific commit SHAs (OSSF)

Agent-Logs-Url: https://github.com/mikefarah/yq/sessions/cbd03f0a-f2dc-4da4-b01c-7dd06ad83ee9

Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>

* chore: pin Dockerfile base images to specific SHA digests (OSSF)

Agent-Logs-Url: https://github.com/mikefarah/yq/sessions/7a8f6690-37fb-42ab-b3dc-0dd23c270fbe

Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>

* chore: revert yq pins in test-yq.yml; add release note for github-action/Dockerfile SHA

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Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>

.github/workflows/release.yml

@@ -9,8 +9,8 @@ jobs:
   publishGitRelease:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-go@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
         with:
           go-version: '^1.20'
           check-latest: true
@@ -44,7 +44,7 @@ jobs:
           ./scripts/xcompile.sh
 
       - name: Release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@3bb12739c298aeb8a4eeaf626c5b8d85266b0e65 # v2.6.2
         with:
           files: build/*
           draft: true