chore(deps): pin ubuntu docker tag to 20fa2d7

Author: renovate[bot]

Dockerfile.template

@@ -1,6 +1,6 @@
 #syntax=docker/dockerfile:1.4.3
 
-ARG image=ubuntu:22.04
+ARG image=ubuntu:22.04@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1
 ARG ref=main
 # INSERT FROM
 

tools/reptyr/Dockerfile.template

@@ -2,7 +2,7 @@
 
 ARG ref=main
 
-FROM ubuntu:22.04 AS build
+FROM ubuntu:22.04@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1 AS build
 RUN <<EOF
 apt-get update
 apt-get -y install --no-install-recommends \

tools/su-exec/Dockerfile.template

@@ -2,7 +2,7 @@
 
 ARG ref=main
 
-FROM ubuntu:22.04 AS build
+FROM ubuntu:22.04@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1 AS build
 RUN <<EOF
 apt-get update
 apt-get -y install --no-install-recommends \

tools/tasker/Dockerfile.template

@@ -2,7 +2,7 @@
 
 ARG ref=main
 
-FROM ubuntu:22.04 AS build
+FROM ubuntu:22.04@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1 AS build
 RUN <<EOF
 apt-get update
 apt-get -y install --no-install-recommends \

tools/uidmap/Dockerfile.template

@@ -2,7 +2,7 @@
 
 ARG ref=main
 
-FROM ubuntu:22.04 AS build
+FROM ubuntu:22.04@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1 AS build
 RUN <<EOF
 apt-get update
 apt-get -y install --no-install-recommends \

tools/util-linux/Dockerfile.template

@@ -2,7 +2,7 @@
 
 ARG ref=main
 
-FROM ubuntu:22.04 AS build
+FROM ubuntu:22.04@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1 AS build
 RUN <<EOF
 apt-get update
 apt-get -y install --no-install-recommends \