[chore] Update grype workflow and pin Docker base images

.github/workflows/grype.yml

@@ -19,21 +19,26 @@ jobs:
   linux:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - name: Harden Runner
+      uses: step-security/harden-runner@eb238b55efaa70779f274895e782ed17c84f2895 # v2.6.1
+      with:
+        egress-policy: audit
+
+    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       with:
         fetch-depth: 0
     - name: Set up Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
       with:
         go-version: '1.21'
-    - uses: actions/cache@v3
+    - uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3.3.2
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
         restore-keys: |
           ${{ runner.os }}-go-
     - name: Scan current project
-      uses: anchore/scan-action@v3
+      uses: anchore/scan-action@24fd7c9060f3c96848dd1929fac8d796fb5ae4b4 # v3.3.6
       with:
         path: "."
         fail-build: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21-alpine AS build-env
+FROM golang:1.21-alpine@sha256:110b07af87238fbdc5f1df52b00927cf58ce3de358eeeb1854f10a8b5e5e1411 AS build-env
 
 ENV CGO_ENABLED 0
 
@@ -59,7 +59,7 @@ RUN go mod download
 RUN make clean
 RUN make git-credential-gopass
 
-FROM alpine:3.18
+FROM alpine@sha256:eece025e432126ce23f223450a0326fbebde39cdf496a85d8c016293fc851978
 RUN apk add --no-cache ca-certificates git gnupg
 COPY --from=build-env /home/runner/work/gopass/gopass/gopass /usr/local/bin/
 COPY --from=build-env /home/runner/work/gopass/gopass-jsonapi/gopass-jsonapi /usr/local/bin/