[StepSecurity] Apply security best practices

.github/workflows/add-to-project.yml

@@ -9,6 +9,11 @@ jobs:
     runs-on: ubuntu-latest
     name: Apply project management flow
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@v2
+        with:
+          egress-policy: audit
+
       - uses: honeycombio/oss-management-actions/projects@v1
         with:
           ghprojects-token: ${{ secrets.GHPROJECTS_TOKEN }}

.github/workflows/apply-labels.yml

@@ -5,6 +5,11 @@ jobs:
     runs-on: ubuntu-latest
     name: Apply common project labels
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@v2
+        with:
+          egress-policy: audit
+
       - uses: honeycombio/oss-management-actions/labels@v1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/stale.yml

@@ -3,6 +3,9 @@ on:
   schedule:
     - cron: '30 1 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   stale:
     name: 'Close stale issues and PRs'
@@ -12,6 +15,11 @@ jobs:
       pull-requests: write
 
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@v2
+        with:
+          egress-policy: audit
+
       - uses: actions/stale@v4
         with:
           start-date: '2021-09-01T00:00:00Z'

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:alpine as builder
+FROM golang:alpine@sha256:47d337594bd9e667d35514b241569f95fb6d95727c24b19468813d596d5ae596 as builder
 
 RUN apk update && apk add --no-cache git ca-certificates && update-ca-certificates