Verify awscli signature before installing

Resolves grafana/k6#1916 (comment)

packaging/Dockerfile

@@ -7,13 +7,21 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update -y && \
     apt-get install -y apt-utils createrepo curl git gnupg2 python3 unzip
 
+COPY ./awscli-key.gpg .
+
 ARG AWSCLI_VERSION=2.1.35
 
-RUN curl -fSsL -o "awscliv2.zip" \
-      "https://awscli.amazonaws.com/awscli-exe-linux-x86_64-$***REMOVED***AWSCLI_VERSION***REMOVED***.zip" && \
-    unzip -q awscliv2.zip && \
+# Download awscli, check GPG signature and install.
+RUN export GNUPGHOME="$(mktemp -d)" && \
+    gpg2 --import ./awscli-key.gpg && \
+    fpr="$(gpg2 --with-colons --fingerprint aws-cli | grep '^fpr' | cut -d: -f10)" && \
+    gpg2 --export-ownertrust && echo "$***REMOVED***fpr***REMOVED***:6:" | gpg2 --import-ownertrust && \
+    curl -fsSL --remote-name-all \
+      "https://awscli.amazonaws.com/awscli-exe-linux-x86_64-$***REMOVED***AWSCLI_VERSION***REMOVED***.zip"***REMOVED***,.sig***REMOVED*** && \
+    gpg2 --verify awscli*.sig awscli*.zip && \
+    unzip -q awscli*.zip && \
     ./aws/install && \
-    rm -rf aws*
+    rm -rf aws* "$GNUPGHOME"
 
 RUN addgroup --gid 1000 k6 && \
     useradd --create-home --shell /bin/bash --no-log-init \

packaging/awscli-key.gpg

@@ -0,0 +1,29 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+YLZATHZKTJyiqA==
+=vYOk
+-----END PGP PUBLIC KEY BLOCK-----