Maintain floating "latest"-Release

.github/workflows/build.yml

@@ -163,10 +163,25 @@ jobs:
         id: create_release
         run: |
           set -xe
-          NAME="Auto-Build $(date +'%Y-%m-%d %H:%M')"
+          RELDATE="$(date +'%Y-%m-%d %H:%M')"
+          NAME="Auto-Build $RELDATE"
           TAGNAME="autobuild-$(date +'%Y-%m-%d-%H-%M')"
           hub release create $(for a in artifacts/*.{zip,tar.xz}; do echo -a $a; done) -m "$NAME" -t "master" "$TAGNAME"
           echo "::set-output name=tag_name::${TAGNAME}"
+          echo "::set-output name=rel_date::${RELDATE}"
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+      - name: Update Latest
+        run: |
+          set -xe
+          mkdir latest_artifacts
+          ./util/repack_latest.sh latest_artifacts artifacts/*.{zip,tar.xz}
+          NAME="Latest Auto-Build (${{ steps.create_release.outputs.rel_date }})"
+          TAGNAME="latest"
+          hub release delete "$TAGNAME" || true
+          git tag -d "$TAGNAME" || true
+          git push --delete origin "$TAGNAME" || true
+          hub release create $(for a in latest_artifacts/*; do echo -a $a; done) -m "$NAME" -t "master" "$TAGNAME"
         env:
           GITHUB_TOKEN: ${{ github.token }}
       - name: Update Wiki

util/repack_latest.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+set -e
+
+if [[ $# -lt 2 ]]; then
+    echo "Missing arguments"
+    exit -1
+fi
+
+RELEASE_DIR="$(realpath "$1")"
+shift
+
+rm -rf repack_dir
+mkdir repack_dir
+trap "rm -rf repack_dir" EXIT
+
+while [[ $# -gt 0 ]]; do
+    INPUT="$1"
+    shift
+
+    rm -rf repack_dir/*
+
+    if [[ $INPUT == *.zip ]]; then
+        unzip "$INPUT" -d repack_dir
+    elif [[ $INPUT == *.tar.xz ]]; then
+        tar xvaf "$INPUT" -C repack_dir
+    else
+        echo "Unknown input file type: $INPUT"
+        exit 1
+    fi
+
+    cd repack_dir
+
+    INAME="$(echo ffmpeg-*)"
+    ONAME="ffmpeg-latest-$(cut -d- -f5- <<<"$INAME")"
+    mv "$INAME" "$ONAME"
+
+    if [[ $INPUT == *.zip ]]; then
+        zip -9 -r "$RELEASE_DIR/$ONAME.zip" "$ONAME"
+    elif [[ $INPUT == *.tar.xz ]]; then
+        tar cvJf "$RELEASE_DIR/$ONAME.tar.xz" "$ONAME"
+    fi
+
+    cd ..
+done